28507040 has 24 divisors (see below), whose sum is σ = 67348260. Its totient is φ = 11402752.

The previous prime is 28507033. The next prime is 28507109. The reversal of 28507040 is 4070582.

It can be written as a sum of positive squares in 2 ways, for example, as 27331984 + 1175056 = 5228^2 + 1084^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88925 + ... + 89244.

Almost surely, 2^28507040 is an apocalyptic number.

28507040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28507040 is an abundant number, since it is smaller than the sum of its proper divisors (38841220).

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

28507040 is a wasteful number, since it uses less digits than its factorization.

28507040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178184 (or 178176 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 28507040 is about 5339.1984417139. The cubic root of 28507040 is about 305.4808861192.

The spelling of 28507040 in words is "twenty-eight million, five hundred seven thousand, forty".