77253257 has 2 divisors, whose sum is σ = 77253258. Its totient is φ = 77253256.

The previous prime is 77253223. The next prime is 77253269. The reversal of 77253257 is 75235277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44408896 + 32844361 = 6664^2 + 5731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77253257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77253257.

It is not a weakly prime, because it can be changed into another prime (77253557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38626628 + 38626629.

It is an arithmetic number, because the mean of its divisors is an integer number (38626629).

Almost surely, 2^77253257 is an apocalyptic number.

It is an amenable number.

77253257 is a deficient number, since it is larger than the sum of its proper divisors (1).

77253257 is an equidigital number, since it uses as much as digits as its factorization.

77253257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102900, while the sum is 38.

The square root of 77253257 is about 8789.3831979269. The cubic root of 77253257 is about 425.8979988253.

The spelling of 77253257 in words is "seventy-seven million, two hundred fifty-three thousand, two hundred fifty-seven".