15621026990 has 32 divisors (see below), whose sum is σ = 28229160960. Its totient is φ = 6223718304.

The previous prime is 15621026989. The next prime is 15621026999. The reversal of 15621026990 is 9962012651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15621026999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3900329 + ... + 3904331.

It is an arithmetic number, because the mean of its divisors is an integer number (882161280).

Almost surely, 2^15621026990 is an apocalyptic number.

15621026990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15621026990 is a deficient number, since it is larger than the sum of its proper divisors (12608133970).

15621026990 is a wasteful number, since it uses less digits than its factorization.

15621026990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5456.

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 15621026990 in words is "fifteen billion, six hundred twenty-one million, twenty-six thousand, nine hundred ninety".