77405057 has 2 divisors, whose sum is σ = 77405058. Its totient is φ = 77405056.

The previous prime is 77405023. The next prime is 77405173. The reversal of 77405057 is 75050477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74718736 + 2686321 = 8644^2 + 1639^2 .

It is an emirp because it is prime and its reverse (75050477) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77405057 is a prime.

It is not a weakly prime, because it can be changed into another prime (77405017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38702528 + 38702529.

It is an arithmetic number, because the mean of its divisors is an integer number (38702529).

Almost surely, 2^77405057 is an apocalyptic number.

It is an amenable number.

77405057 is a deficient number, since it is larger than the sum of its proper divisors (1).

77405057 is an equidigital number, since it uses as much as digits as its factorization.

77405057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34300, while the sum is 35.

The square root of 77405057 is about 8798.0143782560. The cubic root of 77405057 is about 426.1767746294.

The spelling of 77405057 in words is "seventy-seven million, four hundred five thousand, fifty-seven".