28610920 has 32 divisors (see below), whose sum is σ = 69327720. Its totient is φ = 10563840.

The previous prime is 28610917. The next prime is 28610951. The reversal of 28610920 is 2901682.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14638276 + 13972644 = 3826^2 + 3738^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 26991 + ... + 28030.

Almost surely, 2^28610920 is an apocalyptic number.

28610920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28610920 is an abundant number, since it is smaller than the sum of its proper divisors (40716800).

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

28610920 is a wasteful number, since it uses less digits than its factorization.

28610920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55045 (or 55041 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28610920 is about 5348.9176475246. The cubic root of 28610920 is about 305.8514950017.

The spelling of 28610920 in words is "twenty-eight million, six hundred ten thousand, nine hundred twenty".