621379563 has 32 divisors (see below), whose sum is σ = 1019589120. Its totient is φ = 328512000.

The previous prime is 621379547. The next prime is 621379571. The reversal of 621379563 is 365973126.

It is not a de Polignac number, because 621379563 - 2⁴ = 621379547 is a prime.

It is a super-2 number, since 2×621379563² = 772225122628141938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621379513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6313 + ... + 35813.

It is an arithmetic number, because the mean of its divisors is an integer number (31862160).

Almost surely, 2^621379563 is an apocalyptic number.

621379563 is a deficient number, since it is larger than the sum of its proper divisors (398209557).

621379563 is a wasteful number, since it uses less digits than its factorization.

621379563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29587.

The product of its digits is 204120, while the sum is 42.

The square root of 621379563 is about 24927.4860946707. The cubic root of 621379563 is about 853.3338792755. Note that the first 3 decimals are identical.

The spelling of 621379563 in words is "six hundred twenty-one million, three hundred seventy-nine thousand, five hundred sixty-three".