69640532640 has 432 divisors, whose sum is σ = 292714734312. Its totient is φ = 14981234688.

The previous prime is 69640532597. The next prime is 69640532671. The reversal of 69640532640 is 4623504696.

It can be written as a sum of positive squares in 4 ways, for example, as 62198364816 + 7442167824 = 249396^2 + 86268^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1170492 + ... + 1228548.

Almost surely, 2^69640532640 is an apocalyptic number.

69640532640 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 69640532640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146357367156).

69640532640 is an abundant number, since it is smaller than the sum of its proper divisors (223074201672).

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

69640532640 is a wasteful number, since it uses less digits than its factorization.

69640532640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58109 (or 58091 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 69640532640 in words is "sixty-nine billion, six hundred forty million, five hundred thirty-two thousand, six hundred forty".