69638987664 has 45 divisors (see below), whose sum is σ = 194901307419. Its totient is φ = 23211940320.

The previous prime is 69638987657. The next prime is 69638987669. The reversal of 69638987664 is 46678983696.

The square root of 69638987664 is 263892.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 69638987592 and 69638987601.

It is not an unprimeable number, because it can be changed into a prime (69638987669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3155709 + ... + 3177699.

Almost surely, 2^69638987664 is an apocalyptic number.

69638987664 is the 263892-nd square number.

It is an amenable number.

69638987664 is an abundant number, since it is smaller than the sum of its proper divisors (125262319755).

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

69638987664 is an frugal number, since it uses more digits than its factorization.

69638987664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43996 (or 21996 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 72.

The spelling of 69638987664 in words is "sixty-nine billion, six hundred thirty-eight million, nine hundred eighty-seven thousand, six hundred sixty-four".