77976973 has 2 divisors, whose sum is σ = 77976974. Its totient is φ = 77976972.

The previous prime is 77976961. The next prime is 77976989. The reversal of 77976973 is 37967977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69438889 + 8538084 = 8333^2 + 2922^2 .

It is an emirp because it is prime and its reverse (37967977) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77976973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77976953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38988486 + 38988487.

It is an arithmetic number, because the mean of its divisors is an integer number (38988487).

Almost surely, 2^77976973 is an apocalyptic number.

It is an amenable number.

77976973 is a deficient number, since it is larger than the sum of its proper divisors (1).

77976973 is an equidigital number, since it uses as much as digits as its factorization.

77976973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3500658, while the sum is 55.

The square root of 77976973 is about 8830.4571229354. The cubic root of 77976973 is about 427.2238185139.

The spelling of 77976973 in words is "seventy-seven million, nine hundred seventy-six thousand, nine hundred seventy-three".