78902891 has 2 divisors, whose sum is σ = 78902892. Its totient is φ = 78902890.

The previous prime is 78902851. The next prime is 78902911. The reversal of 78902891 is 19820987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78902891 - 2⁶ = 78902827 is a prime.

It is not a weakly prime, because it can be changed into another prime (78902851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39451445 + 39451446.

It is an arithmetic number, because the mean of its divisors is an integer number (39451446).

Almost surely, 2^78902891 is an apocalyptic number.

78902891 is a deficient number, since it is larger than the sum of its proper divisors (1).

78902891 is an equidigital number, since it uses as much as digits as its factorization.

78902891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 78902891 is about 8882.7299294755. The cubic root of 78902891 is about 428.9081565967.

The spelling of 78902891 in words is "seventy-eight million, nine hundred two thousand, eight hundred ninety-one".