69128640 has 336 divisors, whose sum is σ = 284024832. Its totient is φ = 15676416.

The previous prime is 69128629. The next prime is 69128651. The reversal of 69128640 is 4682196.

69128640 is a `hidden beast` number, since 6 + 9 + 1 + 2 + 8 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (69128629) and next prime (69128651).

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 69128595 and 69128604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 544257 + ... + 544383.

It is an arithmetic number, because the mean of its divisors is an integer number (845312).

Almost surely, 2^69128640 is an apocalyptic number.

69128640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69128640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142012416).

69128640 is an abundant number, since it is smaller than the sum of its proper divisors (214896192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

69128640 is a wasteful number, since it uses less digits than its factorization.

69128640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 69128640 is about 8314.3634753359. The cubic root of 69128640 is about 410.4113262494.

The spelling of 69128640 in words is "sixty-nine million, one hundred twenty-eight thousand, six hundred forty".