621656130 has 16 divisors (see below), whose sum is σ = 1491974784. Its totient is φ = 165774960.

The previous prime is 621656107. The next prime is 621656137. The reversal of 621656130 is 31656126.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 20721871 = 621656130 / (6 + 2 + 1 + 6 + 5 + 6 + 1 + 3 + 0).

It is not an unprimeable number, because it can be changed into a prime (621656137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10360906 + ... + 10360965.

It is an arithmetic number, because the mean of its divisors is an integer number (93248424).

Almost surely, 2^621656130 is an apocalyptic number.

621656130 is an abundant number, since it is smaller than the sum of its proper divisors (870318654).

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

621656130 is a wasteful number, since it uses less digits than its factorization.

621656130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20721881.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 621656130 is about 24933.0329081722. The cubic root of 621656130 is about 853.4604626607.

The spelling of 621656130 in words is "six hundred twenty-one million, six hundred fifty-six thousand, one hundred thirty".