78876731 has 2 divisors, whose sum is σ = 78876732. Its totient is φ = 78876730.

The previous prime is 78876703. The next prime is 78876737. The reversal of 78876731 is 13767887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78876731 - 2¹⁴ = 78860347 is a prime.

It is a super-2 number, since 2×78876731² = 12443077386492722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78876737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39438365 + 39438366.

It is an arithmetic number, because the mean of its divisors is an integer number (39438366).

Almost surely, 2^78876731 is an apocalyptic number.

78876731 is a deficient number, since it is larger than the sum of its proper divisors (1).

78876731 is an equidigital number, since it uses as much as digits as its factorization.

78876731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 47.

The square root of 78876731 is about 8881.2572871188. The cubic root of 78876731 is about 428.8607503168.

The spelling of 78876731 in words is "seventy-eight million, eight hundred seventy-six thousand, seven hundred thirty-one".