77961307 has 2 divisors, whose sum is σ = 77961308. Its totient is φ = 77961306.

The previous prime is 77961287. The next prime is 77961343. The reversal of 77961307 is 70316977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77961307 - 2⁷ = 77961179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77961307.

It is not a weakly prime, because it can be changed into another prime (77961607) 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, 38980653 + 38980654.

It is an arithmetic number, because the mean of its divisors is an integer number (38980654).

Almost surely, 2^77961307 is an apocalyptic number.

77961307 is a deficient number, since it is larger than the sum of its proper divisors (1).

77961307 is an equidigital number, since it uses as much as digits as its factorization.

77961307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55566, while the sum is 40.

The square root of 77961307 is about 8829.5700348318. The cubic root of 77961307 is about 427.1952060644.

The spelling of 77961307 in words is "seventy-seven million, nine hundred sixty-one thousand, three hundred seven".