28392457 has 2 divisors, whose sum is σ = 28392458. Its totient is φ = 28392456.

The previous prime is 28392449. The next prime is 28392467. The reversal of 28392457 is 75429382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20034576 + 8357881 = 4476^2 + 2891^2 .

It is a cyclic number.

It is not a de Polignac number, because 28392457 - 2³ = 28392449 is a prime.

It is a super-2 number, since 2×28392457² = 1612263228993698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28392407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14196228 + 14196229.

It is an arithmetic number, because the mean of its divisors is an integer number (14196229).

Almost surely, 2^28392457 is an apocalyptic number.

It is an amenable number.

28392457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28392457 is an equidigital number, since it uses as much as digits as its factorization.

28392457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 28392457 is about 5328.4572814277. The cubic root of 28392457 is about 305.0710467833.

The spelling of 28392457 in words is "twenty-eight million, three hundred ninety-two thousand, four hundred fifty-seven".