656905490 has 32 divisors (see below), whose sum is σ = 1201578624. Its totient is φ = 258522880.

The previous prime is 656905489. The next prime is 656905493. The reversal of 656905490 is 94509656.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (656905493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 671882 + ... + 672858.

It is an arithmetic number, because the mean of its divisors is an integer number (37549332).

Almost surely, 2^656905490 is an apocalyptic number.

656905490 is a deficient number, since it is larger than the sum of its proper divisors (544673134).

656905490 is a wasteful number, since it uses less digits than its factorization.

656905490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 656905490 is about 25630.1675765103. The cubic root of 656905490 is about 869.2958983652.

The spelling of 656905490 in words is "six hundred fifty-six million, nine hundred five thousand, four hundred ninety".