28733831 has 16 divisors (see below), whose sum is σ = 34435584. Its totient is φ = 23442144.

The previous prime is 28733827. The next prime is 28733857. The reversal of 28733831 is 13833782.

28733831 = T₇₄ + T₇₅ + ... + T₅₅₆.

It is a cyclic number.

It is not a de Polignac number, because 28733831 - 2² = 28733827 is a prime.

It is a super-2 number, since 2×28733831² = 1651266087873122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28733791 and 28733800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28733891) 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, 50756 + ... + 51318.

It is an arithmetic number, because the mean of its divisors is an integer number (2152224).

Almost surely, 2^28733831 is an apocalyptic number.

28733831 is a deficient number, since it is larger than the sum of its proper divisors (5701753).

28733831 is a wasteful number, since it uses less digits than its factorization.

28733831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

The product of its digits is 24192, while the sum is 35.

The square root of 28733831 is about 5360.3946683057. The cubic root of 28733831 is about 306.2888432752.

The spelling of 28733831 in words is "twenty-eight million, seven hundred thirty-three thousand, eight hundred thirty-one".