15550990 has 64 divisors (see below), whose sum is σ = 35997696. Its totient is φ = 4701312.

The previous prime is 15550979. The next prime is 15550991. The reversal of 15550990 is 9905551.

15550990 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

15550990 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20559 + ... + 21301.

It is an arithmetic number, because the mean of its divisors is an integer number (562464).

Almost surely, 2^15550990 is an apocalyptic number.

15550990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15550990 is the 3220-th pentagonal number.

15550990 is an abundant number, since it is smaller than the sum of its proper divisors (20446706).

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

15550990 is a wasteful number, since it uses less digits than its factorization.

15550990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 15550990 is about 3943.4743564527. The cubic root of 15550990 is about 249.6046551393.

The spelling of 15550990 in words is "fifteen million, five hundred fifty thousand, nine hundred ninety".