28508937 has 16 divisors (see below), whose sum is σ = 39840768. Its totient is φ = 18098960.

The previous prime is 28508903. The next prime is 28508947. The reversal of 28508937 is 73980582.

It is a cyclic number.

It is not a de Polignac number, because 28508937 - 2⁸ = 28508681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28508947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17362 + ... + 18932.

It is an arithmetic number, because the mean of its divisors is an integer number (2490048).

Almost surely, 2^28508937 is an apocalyptic number.

It is an amenable number.

28508937 is a deficient number, since it is larger than the sum of its proper divisors (11331831).

28508937 is a wasteful number, since it uses less digits than its factorization.

28508937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 28508937 is about 5339.3760871473. The cubic root of 28508937 is about 305.4876620406.

The spelling of 28508937 in words is "twenty-eight million, five hundred eight thousand, nine hundred thirty-seven".