28709132 has 12 divisors (see below), whose sum is σ = 50283576. Its totient is φ = 14342400.

The previous prime is 28709113. The next prime is 28709173. The reversal of 28709132 is 23190782.

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, 4163 + ... + 8645.

It is an arithmetic number, because the mean of its divisors is an integer number (4190298).

Almost surely, 2^28709132 is an apocalyptic number.

It is an amenable number.

28709132 is a deficient number, since it is larger than the sum of its proper divisors (21574444).

28709132 is a wasteful number, since it uses less digits than its factorization.

28709132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6088 (or 6086 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28709132 is about 5358.0903314521. The cubic root of 28709132 is about 306.2010582904.

The spelling of 28709132 in words is "twenty-eight million, seven hundred nine thousand, one hundred thirty-two".