621107990 has 16 divisors (see below), whose sum is σ = 1125500400. Its totient is φ = 246775200.

The previous prime is 621107987. The next prime is 621107999. The reversal of 621107990 is 99701126.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621107990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621107999) 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 7 ways as a sum of consecutive naturals, for example, 206936 + ... + 209915.

It is an arithmetic number, because the mean of its divisors is an integer number (70343775).

Almost surely, 2^621107990 is an apocalyptic number.

621107990 is a deficient number, since it is larger than the sum of its proper divisors (504392410).

621107990 is a wasteful number, since it uses less digits than its factorization.

621107990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417007.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 621107990 is about 24922.0382392773. The cubic root of 621107990 is about 853.2095450658.

The spelling of 621107990 in words is "six hundred twenty-one million, one hundred seven thousand, nine hundred ninety".