621979245 has 24 divisors (see below), whose sum is σ = 1091750400. Its totient is φ = 327521376.

The previous prime is 621979243. The next prime is 621979249. The reversal of 621979245 is 542979126.

It is not a de Polignac number, because 621979245 - 2¹ = 621979243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 621979245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621979243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83925 + ... + 91034.

It is an arithmetic number, because the mean of its divisors is an integer number (45489600).

Almost surely, 2^621979245 is an apocalyptic number.

It is an amenable number.

621979245 is a deficient number, since it is larger than the sum of its proper divisors (469771155).

621979245 is a wasteful number, since it uses less digits than its factorization.

621979245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175049 (or 175046 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 621979245 is about 24939.5117233678. The cubic root of 621979245 is about 853.6083032969.

The spelling of 621979245 in words is "six hundred twenty-one million, nine hundred seventy-nine thousand, two hundred forty-five".