678764624 has 10 divisors (see below), whose sum is σ = 1315106490. Its totient is φ = 339382304.

The previous prime is 678764617. The next prime is 678764657. The reversal of 678764624 is 426467876.

It can be written as a sum of positive squares in only one way, i.e., 359785024 + 318979600 = 18968^2 + 17860^2 .

It is a super-2 number, since 2×678764624² = 921442829587722752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21211379 + ... + 21211410.

It is an arithmetic number, because the mean of its divisors is an integer number (131510649).

Almost surely, 2^678764624 is an apocalyptic number.

It is an amenable number.

678764624 is a deficient number, since it is larger than the sum of its proper divisors (636341866).

678764624 is a wasteful number, since it uses less digits than its factorization.

678764624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42422797 (or 42422791 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 50.

The square root of 678764624 is about 26053.1115991929. Note that the first 3 decimals coincide. The cubic root of 678764624 is about 878.8330883032.

The spelling of 678764624 in words is "six hundred seventy-eight million, seven hundred sixty-four thousand, six hundred twenty-four".