28632539 has 32 divisors (see below), whose sum is σ = 35126784. Its totient is φ = 23063040.

The previous prime is 28632533. The next prime is 28632559. The reversal of 28632539 is 93523682.

It is not a de Polignac number, because 28632539 - 2⁸ = 28632283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28632533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218504 + ... + 218634.

It is an arithmetic number, because the mean of its divisors is an integer number (1097712).

Almost surely, 2^28632539 is an apocalyptic number.

28632539 is a deficient number, since it is larger than the sum of its proper divisors (6494245).

28632539 is a wasteful number, since it uses less digits than its factorization.

28632539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227.

The product of its digits is 77760, while the sum is 38.

The square root of 28632539 is about 5350.9381420457. The cubic root of 28632539 is about 305.9285115014.

The spelling of 28632539 in words is "twenty-eight million, six hundred thirty-two thousand, five hundred thirty-nine".