648947856 has 40 divisors (see below), whose sum is σ = 1680142464. Its totient is φ = 215839360.

The previous prime is 648947837. The next prime is 648947879. The reversal of 648947856 is 658749846.

It is a super-2 number, since 2×648947856² = 842266639613993472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648947796 and 648947805.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7465 + ... + 36791.

Almost surely, 2^648947856 is an apocalyptic number.

It is an amenable number.

648947856 is an abundant number, since it is smaller than the sum of its proper divisors (1031194608).

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

648947856 is a wasteful number, since it uses less digits than its factorization.

648947856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29799 (or 29793 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The square root of 648947856 is about 25474.4549696358. The cubic root of 648947856 is about 865.7714640689.

It can be divided in two parts, 6489 and 47856, that added together give a palindrome (54345).

The spelling of 648947856 in words is "six hundred forty-eight million, nine hundred forty-seven thousand, eight hundred fifty-six".