28906920 has 96 divisors (see below), whose sum is σ = 107377920. Its totient is φ = 6606720.

The previous prime is 28906901. The next prime is 28906951. The reversal of 28906920 is 2960982.

It is a super-2 number, since 2×28906920² = 1671220047772800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3216 + ... + 8255.

It is an arithmetic number, because the mean of its divisors is an integer number (1118520).

Almost surely, 2^28906920 is an apocalyptic number.

28906920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28906920 is an abundant number, since it is smaller than the sum of its proper divisors (78471000).

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

28906920 is a wasteful number, since it uses less digits than its factorization.

28906920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11495 (or 11488 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28906920 is about 5376.5156002750. The cubic root of 28906920 is about 306.9026276798.

The spelling of 28906920 in words is "twenty-eight million, nine hundred six thousand, nine hundred twenty".