28620320 has 24 divisors (see below), whose sum is σ = 67615884. Its totient is φ = 11448064.

The previous prime is 28620311. The next prime is 28620343. The reversal of 28620320 is 2302682.

It can be written as a sum of positive squares in 2 ways, for example, as 28430224 + 190096 = 5332^2 + 436^2 .

It is an unprimeable number.

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, 89279 + ... + 89598.

Almost surely, 2^28620320 is an apocalyptic number.

28620320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28620320 is an abundant number, since it is smaller than the sum of its proper divisors (38995564).

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

28620320 is a wasteful number, since it uses less digits than its factorization.

28620320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178892 (or 178884 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 28620320 is about 5349.7962578027. The cubic root of 28620320 is about 305.8849867507.

The spelling of 28620320 in words is "twenty-eight million, six hundred twenty thousand, three hundred twenty".