28951915939 has 2 divisors, whose sum is σ = 28951915940. Its totient is φ = 28951915938.

The previous prime is 28951915921. The next prime is 28951915973. The reversal of 28951915939 is 93951915982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28951915939 - 2⁵ = 28951915907 is a prime.

It is not a weakly prime, because it can be changed into another prime (28951985939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14475957969 + 14475957970.

It is an arithmetic number, because the mean of its divisors is an integer number (14475957970).

Almost surely, 2^28951915939 is an apocalyptic number.

28951915939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28951915939 is an equidigital number, since it uses as much as digits as its factorization.

28951915939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7873200, while the sum is 61.

The spelling of 28951915939 in words is "twenty-eight billion, nine hundred fifty-one million, nine hundred fifteen thousand, nine hundred thirty-nine".