678811256 has 8 divisors (see below), whose sum is σ = 1272771120. Its totient is φ = 339405624.

The previous prime is 678811229. The next prime is 678811261. The reversal of 678811256 is 652118876.

678811256 = 6506² + 6507² + ... + 6521².

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

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, 42425696 + ... + 42425711.

It is an arithmetic number, because the mean of its divisors is an integer number (159096390).

Almost surely, 2^678811256 is an apocalyptic number.

It is an amenable number.

678811256 is a deficient number, since it is larger than the sum of its proper divisors (593959864).

678811256 is a wasteful number, since it uses less digits than its factorization.

678811256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84851413 (or 84851409 counting only the distinct ones).

The product of its digits is 161280, while the sum is 44.

The square root of 678811256 is about 26054.0065249090. The cubic root of 678811256 is about 878.8532134957.

The spelling of 678811256 in words is "six hundred seventy-eight million, eight hundred eleven thousand, two hundred fifty-six".