78825731 has 2 divisors, whose sum is σ = 78825732. Its totient is φ = 78825730.

The previous prime is 78825727. The next prime is 78825743. The reversal of 78825731 is 13752887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78825731 - 2² = 78825727 is a prime.

It is a super-2 number, since 2×78825731² = 12426991735368722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78825781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39412865 + 39412866.

It is an arithmetic number, because the mean of its divisors is an integer number (39412866).

Almost surely, 2^78825731 is an apocalyptic number.

78825731 is a deficient number, since it is larger than the sum of its proper divisors (1).

78825731 is an equidigital number, since it uses as much as digits as its factorization.

78825731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 41.

The square root of 78825731 is about 8878.3856077555. The cubic root of 78825731 is about 428.7682996720.

The spelling of 78825731 in words is "seventy-eight million, eight hundred twenty-five thousand, seven hundred thirty-one".