69904640 has 72 divisors (see below), whose sum is σ = 180366648. Its totient is φ = 25804800.

The previous prime is 69904607. The next prime is 69904649. The reversal of 69904640 is 4640996.

It can be written as a sum of positive squares in 4 ways, for example, as 1478656 + 68425984 = 1216^2 + 8272^2 .

It is a junction number, because it is equal to n+sod(n) for n = 69904594 and 69904603.

It is not an unprimeable number, because it can be changed into a prime (69904649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14540 + ... + 18740.

Almost surely, 2^69904640 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 69904640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90183324).

69904640 is an abundant number, since it is smaller than the sum of its proper divisors (110462008).

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

69904640 is a wasteful number, since it uses less digits than its factorization.

69904640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4235 (or 4221 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 69904640 is about 8360.8994731428. The cubic root of 69904640 is about 411.9412993316.

The spelling of 69904640 in words is "sixty-nine million, nine hundred four thousand, six hundred forty".