621976140 has 72 divisors (see below), whose sum is σ = 1889229888. Its totient is φ = 165634560.

The previous prime is 621976111. The next prime is 621976177. The reversal of 621976140 is 41679126.

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

It is a junction number, because it is equal to n+sod(n) for n = 621976095 and 621976104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162084 + ... + 165876.

It is an arithmetic number, because the mean of its divisors is an integer number (26239304).

Almost surely, 2^621976140 is an apocalyptic number.

621976140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621976140 is an abundant number, since it is smaller than the sum of its proper divisors (1267253748).

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

621976140 is a wasteful number, since it uses less digits than its factorization.

621976140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4719 (or 4714 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 621976140 is about 24939.4494726728. The cubic root of 621976140 is about 853.6068828539.

The spelling of 621976140 in words is "six hundred twenty-one million, nine hundred seventy-six thousand, one hundred forty".