69401664 has 56 divisors (see below), whose sum is σ = 204033120. Its totient is φ = 23133312.

The previous prime is 69401663. The next prime is 69401671. The reversal of 69401664 is 46610496.

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

It is not an unprimeable number, because it can be changed into a prime (69401663) 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, 18354 + ... + 21809.

Almost surely, 2^69401664 is an apocalyptic number.

69401664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

69401664 is an abundant number, since it is smaller than the sum of its proper divisors (134631456).

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

69401664 is a wasteful number, since it uses less digits than its factorization.

69401664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40184 (or 40168 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 69401664 is about 8330.7661112289. The cubic root of 69401664 is about 410.9509238648.

The spelling of 69401664 in words is "sixty-nine million, four hundred one thousand, six hundred sixty-four".