191620656 has 30 divisors (see below), whose sum is σ = 536272100. Its totient is φ = 63873504.

The previous prime is 191620621. The next prime is 191620673. The reversal of 191620656 is 656026191.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 191620656.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665206 + ... + 665493.

Almost surely, 2^191620656 is an apocalyptic number.

191620656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

191620656 is an abundant number, since it is smaller than the sum of its proper divisors (344651444).

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

191620656 is a wasteful number, since it uses less digits than its factorization.

191620656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330713 (or 1330704 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 191620656 is about 13842.7112951185. The cubic root of 191620656 is about 576.5196410162.

The spelling of 191620656 in words is "one hundred ninety-one million, six hundred twenty thousand, six hundred fifty-six".