28236731 has 2 divisors, whose sum is σ = 28236732. Its totient is φ = 28236730.

The previous prime is 28236727. The next prime is 28236737. The reversal of 28236731 is 13763282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28236731 - 2² = 28236727 is a prime.

It is a super-2 number, since 2×28236731² = 1594625955132722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28236737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14118365 + 14118366.

It is an arithmetic number, because the mean of its divisors is an integer number (14118366).

Almost surely, 2^28236731 is an apocalyptic number.

28236731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28236731 is an equidigital number, since it uses as much as digits as its factorization.

28236731 is an evil number, because the sum of its binary digits is even.

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

The square root of 28236731 is about 5313.8245172380. The cubic root of 28236731 is about 304.5122761293.

The spelling of 28236731 in words is "twenty-eight million, two hundred thirty-six thousand, seven hundred thirty-one".