28490320 has 20 divisors (see below), whose sum is σ = 66240180. Its totient is φ = 11396096.

The previous prime is 28490279. The next prime is 28490327. The reversal of 28490320 is 2309482.

It can be written as a sum of positive squares in 2 ways, for example, as 9585216 + 18905104 = 3096^2 + 4348^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28490327) 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, 177985 + ... + 178144.

It is an arithmetic number, because the mean of its divisors is an integer number (3312009).

Almost surely, 2^28490320 is an apocalyptic number.

28490320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28490320 is an abundant number, since it is smaller than the sum of its proper divisors (37749860).

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

28490320 is a wasteful number, since it uses less digits than its factorization.

28490320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356142 (or 356136 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28490320 is about 5337.6324339542. The cubic root of 28490320 is about 305.4211507074.

The spelling of 28490320 in words is "twenty-eight million, four hundred ninety thousand, three hundred twenty".