28715807 has 2 divisors, whose sum is σ = 28715808. Its totient is φ = 28715806.

The previous prime is 28715803. The next prime is 28715833. The reversal of 28715807 is 70851782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28715807 - 2² = 28715803 is a prime.

It is a super-2 number, since 2×28715807² = 1649195143322498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28715803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14357903 + 14357904.

It is an arithmetic number, because the mean of its divisors is an integer number (14357904).

Almost surely, 2^28715807 is an apocalyptic number.

28715807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28715807 is an equidigital number, since it uses as much as digits as its factorization.

28715807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 28715807 is about 5358.7131850846. The cubic root of 28715807 is about 306.2247874843.

The spelling of 28715807 in words is "twenty-eight million, seven hundred fifteen thousand, eight hundred seven".