77331238 has 4 divisors (see below), whose sum is σ = 115996860. Its totient is φ = 38665618.

The previous prime is 77331227. The next prime is 77331253. The reversal of 77331238 is 83213377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83213377 = 13 ⋅6401029.

It is a super-2 number, since 2×77331238² = 11960240741225288, which contains 22 as substring.

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, 19332808 + ... + 19332811.

It is an arithmetic number, because the mean of its divisors is an integer number (28999215).

Almost surely, 2^77331238 is an apocalyptic number.

77331238 is a deficient number, since it is larger than the sum of its proper divisors (38665622).

77331238 is a wasteful number, since it uses less digits than its factorization.

77331238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38665621.

The product of its digits is 21168, while the sum is 34.

The square root of 77331238 is about 8793.8181696007. The cubic root of 77331238 is about 426.0412539857.

The spelling of 77331238 in words is "seventy-seven million, three hundred thirty-one thousand, two hundred thirty-eight".