28333731 has 16 divisors (see below), whose sum is σ = 40003200. Its totient is φ = 17788608.

The previous prime is 28333727. The next prime is 28333741. The reversal of 28333731 is 13733382.

It is not a de Polignac number, because 28333731 - 2² = 28333727 is a prime.

It is a super-2 number, since 2×28333731² = 1605600624760722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28333741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8815 + ... + 11591.

It is an arithmetic number, because the mean of its divisors is an integer number (2500200).

Almost surely, 2^28333731 is an apocalyptic number.

28333731 is a deficient number, since it is larger than the sum of its proper divisors (11669469).

28333731 is a wasteful number, since it uses less digits than its factorization.

28333731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978.

The product of its digits is 9072, while the sum is 30.

The square root of 28333731 is about 5322.9438283717. The cubic root of 28333731 is about 304.8605687149.

The spelling of 28333731 in words is "twenty-eight million, three hundred thirty-three thousand, seven hundred thirty-one".