28920880 has 20 divisors (see below), whose sum is σ = 67241232. Its totient is φ = 11568320.

The previous prime is 28920877. The next prime is 28920883. The reversal of 28920880 is 8802982.

It is an interprime number because it is at equal distance from previous prime (28920877) and next prime (28920883).

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (28920883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180676 + ... + 180835.

Almost surely, 2^28920880 is an apocalyptic number.

28920880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28920880 is an abundant number, since it is smaller than the sum of its proper divisors (38320352).

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

28920880 is a wasteful number, since it uses less digits than its factorization.

28920880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361524 (or 361518 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 28920880 is about 5377.8136821575. The cubic root of 28920880 is about 306.9520238242.

The spelling of 28920880 in words is "twenty-eight million, nine hundred twenty thousand, eight hundred eighty".