28672131 has 4 divisors (see below), whose sum is σ = 38229512. Its totient is φ = 19114752.

The previous prime is 28672109. The next prime is 28672139. The reversal of 28672131 is 13127682.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28672131 - 2⁶ = 28672067 is a prime.

It is a super-2 number, since 2×28672131² = 1644182192162322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28672139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4778686 + ... + 4778691.

It is an arithmetic number, because the mean of its divisors is an integer number (9557378).

Almost surely, 2^28672131 is an apocalyptic number.

28672131 is a deficient number, since it is larger than the sum of its proper divisors (9557381).

28672131 is an equidigital number, since it uses as much as digits as its factorization.

28672131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9557380.

The product of its digits is 4032, while the sum is 30.

The square root of 28672131 is about 5354.6364022219. The cubic root of 28672131 is about 306.0694553775.

The spelling of 28672131 in words is "twenty-eight million, six hundred seventy-two thousand, one hundred thirty-one".