69660640 has 144 divisors (see below), whose sum is σ = 197993376. Its totient is φ = 22671360.

The previous prime is 69660601. The next prime is 69660649. The reversal of 69660640 is 4606696.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 69660640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69660649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1699020 + ... + 1699060.

It is an arithmetic number, because the mean of its divisors is an integer number (1374954).

Almost surely, 2^69660640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69660640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98996688).

69660640 is an abundant number, since it is smaller than the sum of its proper divisors (128332736).

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

69660640 is a wasteful number, since it uses less digits than its factorization.

69660640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 69660640 is about 8346.2949863997. The cubic root of 69660640 is about 411.4614511128.

The spelling of 69660640 in words is "sixty-nine million, six hundred sixty thousand, six hundred forty".