76972661 has 2 divisors, whose sum is σ = 76972662. Its totient is φ = 76972660.

The previous prime is 76972657. The next prime is 76972663. The reversal of 76972661 is 16627967.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75359761 + 1612900 = 8681^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 76972661 - 2² = 76972657 is a prime.

Together with 76972663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76972663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38486330 + 38486331.

It is an arithmetic number, because the mean of its divisors is an integer number (38486331).

Almost surely, 2^76972661 is an apocalyptic number.

It is an amenable number.

76972661 is a deficient number, since it is larger than the sum of its proper divisors (1).

76972661 is an equidigital number, since it uses as much as digits as its factorization.

76972661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 76972661 is about 8773.4064649941. The cubic root of 76972661 is about 425.3817303877.

The spelling of 76972661 in words is "seventy-six million, nine hundred seventy-two thousand, six hundred sixty-one".