28531907 has 2 divisors, whose sum is σ = 28531908. Its totient is φ = 28531906.

The previous prime is 28531849. The next prime is 28531913. The reversal of 28531907 is 70913582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28531907 - 2⁶ = 28531843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28531507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265953 + 14265954.

It is an arithmetic number, because the mean of its divisors is an integer number (14265954).

Almost surely, 2^28531907 is an apocalyptic number.

28531907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531907 is an equidigital number, since it uses as much as digits as its factorization.

28531907 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 28531907 is about 5341.5266544313. The cubic root of 28531907 is about 305.5696850668.

The spelling of 28531907 in words is "twenty-eight million, five hundred thirty-one thousand, nine hundred seven".