77137944 has 64 divisors (see below), whose sum is σ = 208518240. Its totient is φ = 23639040.

The previous prime is 77137943. The next prime is 77137961. The reversal of 77137944 is 44973177.

It is a junction number, because it is equal to n+sod(n) for n = 77137896 and 77137905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77137943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142314 + ... + 142854.

Almost surely, 2^77137944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77137944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104259120).

77137944 is an abundant number, since it is smaller than the sum of its proper divisors (131380296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77137944 is a wasteful number, since it uses less digits than its factorization.

77137944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1016 counting only the distinct ones).

The product of its digits is 148176, while the sum is 42.

The square root of 77137944 is about 8782.8209591224. The cubic root of 77137944 is about 425.6859860516.

The spelling of 77137944 in words is "seventy-seven million, one hundred thirty-seven thousand, nine hundred forty-four".