77757142 has 4 divisors (see below), whose sum is σ = 116635716. Its totient is φ = 38878570.

The previous prime is 77757079. The next prime is 77757151. The reversal of 77757142 is 24175777.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 77757095 and 77757104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19439284 + ... + 19439287.

It is an arithmetic number, because the mean of its divisors is an integer number (29158929).

Almost surely, 2^77757142 is an apocalyptic number.

77757142 is a deficient number, since it is larger than the sum of its proper divisors (38878574).

77757142 is a wasteful number, since it uses less digits than its factorization.

77757142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38878573.

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

The square root of 77757142 is about 8818.0010206395. The cubic root of 77757142 is about 426.8219672561.

The spelling of 77757142 in words is "seventy-seven million, seven hundred fifty-seven thousand, one hundred forty-two".