621225690 has 32 divisors (see below), whose sum is σ = 1492050240. Its totient is φ = 165537024.

The previous prime is 621225637. The next prime is 621225719. The reversal of 621225690 is 96522126.

It is a super-2 number, since 2×621225690² = 771842715831952200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37717 + ... + 51623.

It is an arithmetic number, because the mean of its divisors is an integer number (46626570).

Almost surely, 2^621225690 is an apocalyptic number.

621225690 is an abundant number, since it is smaller than the sum of its proper divisors (870824550).

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

621225690 is a wasteful number, since it uses less digits than its factorization.

621225690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15406.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 621225690 is about 24924.3994912616. The cubic root of 621225690 is about 853.2634360812.

The spelling of 621225690 in words is "six hundred twenty-one million, two hundred twenty-five thousand, six hundred ninety".