655909870 has 32 divisors (see below), whose sum is σ = 1471965696. Its totient is φ = 204439200.

The previous prime is 655909867. The next prime is 655909889. The reversal of 655909870 is 78909556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425146 + ... + 426685.

It is an arithmetic number, because the mean of its divisors is an integer number (45998928).

Almost surely, 2^655909870 is an apocalyptic number.

655909870 is an abundant number, since it is smaller than the sum of its proper divisors (816055826).

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

655909870 is a wasteful number, since it uses less digits than its factorization.

655909870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851856.

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 655909870 is about 25610.7373966467. The cubic root of 655909870 is about 868.8565018234.

The spelling of 655909870 in words is "six hundred fifty-five million, nine hundred nine thousand, eight hundred seventy".