77973744 has 20 divisors (see below), whose sum is σ = 201432296. Its totient is φ = 25991232.

The previous prime is 77973733. The next prime is 77973761. The reversal of 77973744 is 44737977.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1624453 = 77973744 / (7 + 7 + 9 + 7 + 3 + 7 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 77973693 and 77973702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812179 + ... + 812274.

Almost surely, 2^77973744 is an apocalyptic number.

It is an amenable number.

77973744 is an abundant number, since it is smaller than the sum of its proper divisors (123458552).

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

77973744 is a wasteful number, since it uses less digits than its factorization.

77973744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624464 (or 1624458 counting only the distinct ones).

The product of its digits is 1037232, while the sum is 48.

The square root of 77973744 is about 8830.2742879256. The cubic root of 77973744 is about 427.2179213680.

The spelling of 77973744 in words is "seventy-seven million, nine hundred seventy-three thousand, seven hundred forty-four".