78766761 has 16 divisors (see below), whose sum is σ = 112112640. Its totient is φ = 49044240.

The previous prime is 78766759. The next prime is 78766777. The reversal of 78766761 is 16766787.

It is a happy number.

It is not a de Polignac number, because 78766761 - 2¹ = 78766759 is a prime.

It is a super-2 number, since 2×78766761² = 12408405276862242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78766761.

It is not an unprimeable number, because it can be changed into a prime (78768761) 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 in 15 ways as a sum of consecutive naturals, for example, 5685 + ... + 13778.

It is an arithmetic number, because the mean of its divisors is an integer number (7007040).

Almost surely, 2^78766761 is an apocalyptic number.

78766761 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

78766761 is a deficient number, since it is larger than the sum of its proper divisors (33345879).

78766761 is a wasteful number, since it uses less digits than its factorization.

78766761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19556.

The product of its digits is 592704, while the sum is 48.

The square root of 78766761 is about 8875.0639997692. The cubic root of 78766761 is about 428.6613516230.

The spelling of 78766761 in words is "seventy-eight million, seven hundred sixty-six thousand, seven hundred sixty-one".