621358380 has 36 divisors (see below), whose sum is σ = 1884787632. Its totient is φ = 165695520.

The previous prime is 621358351. The next prime is 621358393. The reversal of 621358380 is 83853126.

621358380 is a `hidden beast` number, since 62 + 13 + 583 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1725816 + ... + 1726175.

It is an arithmetic number, because the mean of its divisors is an integer number (52355212).

Almost surely, 2^621358380 is an apocalyptic number.

621358380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621358380 is an abundant number, since it is smaller than the sum of its proper divisors (1263429252).

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

621358380 is a wasteful number, since it uses less digits than its factorization.

621358380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452006 (or 3452001 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 621358380 is about 24927.0611986251. The cubic root of 621358380 is about 853.3241823699.

The spelling of 621358380 in words is "six hundred twenty-one million, three hundred fifty-eight thousand, three hundred eighty".