28772132 has 12 divisors (see below), whose sum is σ = 50404956. Its totient is φ = 14370720.

The previous prime is 28772077. The next prime is 28772141. The reversal of 28772132 is 23127782.

It can be written as a sum of positive squares in 2 ways, for example, as 19855936 + 8916196 = 4456^2 + 2986^2 .

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, 1082 + ... + 7662.

It is an arithmetic number, because the mean of its divisors is an integer number (4200413).

Almost surely, 2^28772132 is an apocalyptic number.

It is an amenable number.

28772132 is a deficient number, since it is larger than the sum of its proper divisors (21632824).

28772132 is a wasteful number, since it uses less digits than its factorization.

28772132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7678 (or 7676 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 28772132 is about 5363.9660699896. The cubic root of 28772132 is about 306.4248729430.

The spelling of 28772132 in words is "twenty-eight million, seven hundred seventy-two thousand, one hundred thirty-two".