28913918 has 24 divisors (see below), whose sum is σ = 48030024. Its totient is φ = 13044240.

The previous prime is 28913903. The next prime is 28913947. The reversal of 28913918 is 81931982.

It is a super-2 number, since 2×28913918² = 1672029308221448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39080 + ... + 39812.

It is an arithmetic number, because the mean of its divisors is an integer number (2001251).

Almost surely, 2^28913918 is an apocalyptic number.

28913918 is a deficient number, since it is larger than the sum of its proper divisors (19116106).

28913918 is a wasteful number, since it uses less digits than its factorization.

28913918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 909 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 28913918 is about 5377.1663541311. The cubic root of 28913918 is about 306.9273914307.

The spelling of 28913918 in words is "twenty-eight million, nine hundred thirteen thousand, nine hundred eighteen".