28507090 has 16 divisors (see below), whose sum is σ = 51447960. Its totient is φ = 11372800.

The previous prime is 28507033. The next prime is 28507109. The reversal of 28507090 is 9070582.

It can be written as a sum of positive squares in 4 ways, for example, as 25694761 + 2812329 = 5069^2 + 1677^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456 + ... + 7564.

Almost surely, 2^28507090 is an apocalyptic number.

28507090 is a deficient number, since it is larger than the sum of its proper divisors (22940870).

28507090 is a wasteful number, since it uses less digits than its factorization.

28507090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7517.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 28507090 is about 5339.2031240626. The cubic root of 28507090 is about 305.4810647187.

The spelling of 28507090 in words is "twenty-eight million, five hundred seven thousand, ninety".