77142757 has 2 divisors, whose sum is σ = 77142758. Its totient is φ = 77142756.

The previous prime is 77142739. The next prime is 77142763. The reversal of 77142757 is 75724177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56340036 + 20802721 = 7506^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 77142757 - 2²³ = 68754149 is a prime.

It is a super-2 number, since 2×77142757² = 11902009915122098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77140757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38571378 + 38571379.

It is an arithmetic number, because the mean of its divisors is an integer number (38571379).

Almost surely, 2^77142757 is an apocalyptic number.

It is an amenable number.

77142757 is a deficient number, since it is larger than the sum of its proper divisors (1).

77142757 is an equidigital number, since it uses as much as digits as its factorization.

77142757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96040, while the sum is 40.

The square root of 77142757 is about 8783.0949556520. The cubic root of 77142757 is about 425.6948393860.

The spelling of 77142757 in words is "seventy-seven million, one hundred forty-two thousand, seven hundred fifty-seven".