15420864 has 28 divisors (see below), whose sum is σ = 40801544. Its totient is φ = 5140224.

The previous prime is 15420863. The next prime is 15420871. The reversal of 15420864 is 46802451.

15420864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39967 + ... + 40350.

It is an arithmetic number, because the mean of its divisors is an integer number (1457198).

Almost surely, 2^15420864 is an apocalyptic number.

It is an amenable number.

15420864 is an abundant number, since it is smaller than the sum of its proper divisors (25380680).

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

15420864 is an equidigital number, since it uses as much as digits as its factorization.

15420864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80332 (or 80322 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 15420864 is about 3926.9407940533. The cubic root of 15420864 is about 248.9064986595.

The spelling of 15420864 in words is "fifteen million, four hundred twenty thousand, eight hundred sixty-four".