77142287 has 2 divisors, whose sum is σ = 77142288. Its totient is φ = 77142286.

The previous prime is 77142251. The next prime is 77142313. The reversal of 77142287 is 78224177.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77142287 - 2⁸ = 77142031 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77142287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77142187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38571143 + 38571144.

It is an arithmetic number, because the mean of its divisors is an integer number (38571144).

Almost surely, 2^77142287 is an apocalyptic number.

77142287 is a deficient number, since it is larger than the sum of its proper divisors (1).

77142287 is an equidigital number, since it uses as much as digits as its factorization.

77142287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43904, while the sum is 38.

The square root of 77142287 is about 8783.0681996669. The cubic root of 77142287 is about 425.6939748547.

It can be divided in two parts, 7714 and 2287, that added together give a palindrome (10001).

The spelling of 77142287 in words is "seventy-seven million, one hundred forty-two thousand, two hundred eighty-seven".