689724517938 has 32 divisors (see below), whose sum is σ = 1458677832192. Its totient is φ = 217065148800.

The previous prime is 689724517901. The next prime is 689724517957. The reversal of 689724517938 is 839715427986.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45214281 + ... + 45229532.

It is an arithmetic number, because the mean of its divisors is an integer number (45583682256).

Almost surely, 2^689724517938 is an apocalyptic number.

689724517938 is an abundant number, since it is smaller than the sum of its proper divisors (768953314254).

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

689724517938 is a wasteful number, since it uses less digits than its factorization.

689724517938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90443890.

The product of its digits is 182891520, while the sum is 69.

The spelling of 689724517938 in words is "six hundred eighty-nine billion, seven hundred twenty-four million, five hundred seventeen thousand, nine hundred thirty-eight".