76609861 has 2 divisors, whose sum is σ = 76609862. Its totient is φ = 76609860.

The previous prime is 76609817. The next prime is 76609867. The reversal of 76609861 is 16890667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62964225 + 13645636 = 7935^2 + 3694^2 .

It is a cyclic number.

It is not a de Polignac number, because 76609861 - 2⁷ = 76609733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76609867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38304930 + 38304931.

It is an arithmetic number, because the mean of its divisors is an integer number (38304931).

Almost surely, 2^76609861 is an apocalyptic number.

It is an amenable number.

76609861 is a deficient number, since it is larger than the sum of its proper divisors (1).

76609861 is an equidigital number, since it uses as much as digits as its factorization.

76609861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 76609861 is about 8752.7059244556. The cubic root of 76609861 is about 424.7123516093.

The spelling of 76609861 in words is "seventy-six million, six hundred nine thousand, eight hundred sixty-one".