77122142 has 4 divisors (see below), whose sum is σ = 115683216. Its totient is φ = 38561070.

The previous prime is 77122139. The next prime is 77122163. The reversal of 77122142 is 24122177.

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

It is a congruent number.

It is an unprimeable number.

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, 19280534 + ... + 19280537.

It is an arithmetic number, because the mean of its divisors is an integer number (28920804).

Almost surely, 2^77122142 is an apocalyptic number.

77122142 is a deficient number, since it is larger than the sum of its proper divisors (38561074).

77122142 is a wasteful number, since it uses less digits than its factorization.

77122142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38561073.

The product of its digits is 1568, while the sum is 26.

The square root of 77122142 is about 8781.9213159764. The cubic root of 77122142 is about 425.6569162709.

The spelling of 77122142 in words is "seventy-seven million, one hundred twenty-two thousand, one hundred forty-two".