621355140 has 72 divisors (see below), whose sum is σ = 2154035520. Its totient is φ = 142023744.

The previous prime is 621355129. The next prime is 621355153. The reversal of 621355140 is 41553126.

621355140 is a `hidden beast` number, since 62 + 13 + 551 + 40 = 666.

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, 245310 + ... + 247829.

It is an arithmetic number, because the mean of its divisors is an integer number (29917160).

Almost surely, 2^621355140 is an apocalyptic number.

621355140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621355140 is an abundant number, since it is smaller than the sum of its proper divisors (1532680380).

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

621355140 is a wasteful number, since it uses less digits than its factorization.

621355140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493161 (or 493156 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 621355140 is about 24926.9962089298. The cubic root of 621355140 is about 853.3226991812.

The spelling of 621355140 in words is "six hundred twenty-one million, three hundred fifty-five thousand, one hundred forty".