679840662528 has 132 divisors (see below), whose sum is σ = 1983265140220. Its totient is φ = 224277037056.

The previous prime is 679840662521. The next prime is 679840662533. The reversal of 679840662528 is 825266048976.

679840662528 is a `hidden beast` number, since 6 + 7 + 9 + 8 + 40 + 6 + 62 + 528 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 296075280384 + 383765382144 = 544128^2 + 619488^2 .

It is not an unprimeable number, because it can be changed into a prime (679840662521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 513708 + ... + 1274196.

Almost surely, 2^679840662528 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 679840662528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991632570110).

679840662528 is an abundant number, since it is smaller than the sum of its proper divisors (1303424477692).

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

679840662528 is a wasteful number, since it uses less digits than its factorization.

679840662528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760612 (or 760591 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 63.

The spelling of 679840662528 in words is "six hundred seventy-nine billion, eight hundred forty million, six hundred sixty-two thousand, five hundred twenty-eight".