28672331 has 4 divisors (see below), whose sum is σ = 28700664. Its totient is φ = 28644000.

The previous prime is 28672313. The next prime is 28672337. The reversal of 28672331 is 13327682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13327682 = 2 ⋅6663841.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28672331 is a prime.

It is a super-2 number, since 2×28672331² = 1644205129947122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28672337) 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, 12590 + ... + 14691.

It is an arithmetic number, because the mean of its divisors is an integer number (7175166).

Almost surely, 2^28672331 is an apocalyptic number.

28672331 is a deficient number, since it is larger than the sum of its proper divisors (28333).

28672331 is a wasteful number, since it uses less digits than its factorization.

28672331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28332.

The product of its digits is 12096, while the sum is 32.

The square root of 28672331 is about 5354.6550775937. The cubic root of 28672331 is about 306.0701670296.

The spelling of 28672331 in words is "twenty-eight million, six hundred seventy-two thousand, three hundred thirty-one".