28900320 has 48 divisors (see below), whose sum is σ = 91037520. Its totient is φ = 7706624.

The previous prime is 28900309. The next prime is 28900321. The reversal of 28900320 is 2300982.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×28900320² = 1670456992204800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28900321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29625 + ... + 30584.

It is an arithmetic number, because the mean of its divisors is an integer number (1896615).

Almost surely, 2^28900320 is an apocalyptic number.

28900320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28900320 is an abundant number, since it is smaller than the sum of its proper divisors (62137200).

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

28900320 is a wasteful number, since it uses less digits than its factorization.

28900320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60227 (or 60219 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 28900320 is about 5375.9017848171. The cubic root of 28900320 is about 306.8792686650.

The spelling of 28900320 in words is "twenty-eight million, nine hundred thousand, three hundred twenty".