621996090 has 32 divisors (see below), whose sum is σ = 1540947456. Its totient is φ = 160514880.

The previous prime is 621996083. The next prime is 621996097. The reversal of 621996090 is 90699126.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (621996083) and next prime (621996097).

It is not an unprimeable number, because it can be changed into a prime (621996097) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 333477 + ... + 335336.

It is an arithmetic number, because the mean of its divisors is an integer number (48154608).

Almost surely, 2^621996090 is an apocalyptic number.

621996090 is an abundant number, since it is smaller than the sum of its proper divisors (918951366).

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

621996090 is a wasteful number, since it uses less digits than its factorization.

621996090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668854.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 621996090 is about 24939.8494381983. The cubic root of 621996090 is about 853.6160092894.

The spelling of 621996090 in words is "six hundred twenty-one million, nine hundred ninety-six thousand, ninety".