77144918 has 4 divisors (see below), whose sum is σ = 115717380. Its totient is φ = 38572458.

The previous prime is 77144917. The next prime is 77144941. The reversal of 77144918 is 81944177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81944177 = 7 ⋅11706311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77144917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19286228 + ... + 19286231.

It is an arithmetic number, because the mean of its divisors is an integer number (28929345).

Almost surely, 2^77144918 is an apocalyptic number.

77144918 is a deficient number, since it is larger than the sum of its proper divisors (38572462).

77144918 is a wasteful number, since it uses less digits than its factorization.

77144918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38572461.

The product of its digits is 56448, while the sum is 41.

The square root of 77144918 is about 8783.2179752070. The cubic root of 77144918 is about 425.6988143453.

The spelling of 77144918 in words is "seventy-seven million, one hundred forty-four thousand, nine hundred eighteen".