28750913 has 2 divisors, whose sum is σ = 28750914. Its totient is φ = 28750912.

The previous prime is 28750903. The next prime is 28750979. The reversal of 28750913 is 31905782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 11916304 = 4103^2 + 3452^2 .

It is a cyclic number.

It is not a de Polignac number, because 28750913 - 2²⁴ = 11973697 is a prime.

It is a super-2 number, since 2×28750913² = 1653229996667138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28750903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14375456 + 14375457.

It is an arithmetic number, because the mean of its divisors is an integer number (14375457).

Almost surely, 2^28750913 is an apocalyptic number.

It is an amenable number.

28750913 is a deficient number, since it is larger than the sum of its proper divisors (1).

28750913 is an equidigital number, since it uses as much as digits as its factorization.

28750913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28750913 is about 5361.9877843949. The cubic root of 28750913 is about 306.3495265579.

The spelling of 28750913 in words is "twenty-eight million, seven hundred fifty thousand, nine hundred thirteen".