28565731 has 2 divisors, whose sum is σ = 28565732. Its totient is φ = 28565730.

The previous prime is 28565723. The next prime is 28565741. The reversal of 28565731 is 13756582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28565731 - 2³ = 28565723 is a prime.

It is a super-2 number, since 2×28565731² = 1632001975128722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28565741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14282865 + 14282866.

It is an arithmetic number, because the mean of its divisors is an integer number (14282866).

Almost surely, 2^28565731 is an apocalyptic number.

28565731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28565731 is an equidigital number, since it uses as much as digits as its factorization.

28565731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 28565731 is about 5344.6918526703. The cubic root of 28565731 is about 305.6903862816.

The spelling of 28565731 in words is "twenty-eight million, five hundred sixty-five thousand, seven hundred thirty-one".