621364540 has 24 divisors (see below), whose sum is σ = 1318321872. Its totient is φ = 245982720.

The previous prime is 621364537. The next prime is 621364559. The reversal of 621364540 is 45463126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158206 + ... + 162085.

It is an arithmetic number, because the mean of its divisors is an integer number (54930078).

Almost surely, 2^621364540 is an apocalyptic number.

It is an amenable number.

621364540 is an abundant number, since it is smaller than the sum of its proper divisors (696957332).

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

621364540 is a wasteful number, since it uses less digits than its factorization.

621364540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320397 (or 320395 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 621364540 is about 24927.1847588130. The cubic root of 621364540 is about 853.3270022452.

The spelling of 621364540 in words is "six hundred twenty-one million, three hundred sixty-four thousand, five hundred forty".