77222657 has 2 divisors, whose sum is σ = 77222658. Its totient is φ = 77222656.

The previous prime is 77222627. The next prime is 77222671. The reversal of 77222657 is 75622277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71385601 + 5837056 = 8449^2 + 2416^2 .

It is a cyclic number.

It is not a de Polignac number, because 77222657 - 2²⁰ = 76174081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77222657.

It is not a weakly prime, because it can be changed into another prime (77222617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38611328 + 38611329.

It is an arithmetic number, because the mean of its divisors is an integer number (38611329).

Almost surely, 2^77222657 is an apocalyptic number.

It is an amenable number.

77222657 is a deficient number, since it is larger than the sum of its proper divisors (1).

77222657 is an equidigital number, since it uses as much as digits as its factorization.

77222657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 38.

The square root of 77222657 is about 8787.6422890329. The cubic root of 77222657 is about 425.8417586943.

The spelling of 77222657 in words is "seventy-seven million, two hundred twenty-two thousand, six hundred fifty-seven".