621457044 has 24 divisors (see below), whose sum is σ = 1561610400. Its totient is φ = 191217504.

The previous prime is 621457021. The next prime is 621457127. The reversal of 621457044 is 440754126.

It is a junction number, because it is equal to n+sod(n) for n = 621456996 and 621457014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1991694 + ... + 1992005.

It is an arithmetic number, because the mean of its divisors is an integer number (65067100).

Almost surely, 2^621457044 is an apocalyptic number.

It is an amenable number.

621457044 is an abundant number, since it is smaller than the sum of its proper divisors (940153356).

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

621457044 is a wasteful number, since it uses less digits than its factorization.

621457044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983719 (or 3983717 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 621457044 is about 24929.0401740621. The cubic root of 621457044 is about 853.3693457431.

The spelling of 621457044 in words is "six hundred twenty-one million, four hundred fifty-seven thousand, forty-four".