77142237 has 4 divisors (see below), whose sum is σ = 102856320. Its totient is φ = 51428156.

The previous prime is 77142211. The next prime is 77142251. The reversal of 77142237 is 73224177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77142237 - 2⁶ = 77142173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77142198 and 77142207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77142287) 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 in 3 ways as a sum of consecutive naturals, for example, 12857037 + ... + 12857042.

It is an arithmetic number, because the mean of its divisors is an integer number (25714080).

Almost surely, 2^77142237 is an apocalyptic number.

It is an amenable number.

77142237 is a deficient number, since it is larger than the sum of its proper divisors (25714083).

77142237 is a wasteful number, since it uses less digits than its factorization.

77142237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25714082.

The product of its digits is 16464, while the sum is 33.

The square root of 77142237 is about 8783.0653532807. The cubic root of 77142237 is about 425.6938828831.

The spelling of 77142237 in words is "seventy-seven million, one hundred forty-two thousand, two hundred thirty-seven".