77044440 has 64 divisors (see below), whose sum is σ = 252149760. Its totient is φ = 18677120.

The previous prime is 77044381. The next prime is 77044441. The reversal of 77044440 is 4444077.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 77044398 and 77044407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77044441) 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, 27864 + ... + 30503.

It is an arithmetic number, because the mean of its divisors is an integer number (3939840).

Almost surely, 2^77044440 is an apocalyptic number.

It is an amenable number.

77044440 is an abundant number, since it is smaller than the sum of its proper divisors (175105320).

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

77044440 is a wasteful number, since it uses less digits than its factorization.

77044440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58392 (or 58388 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 30.

The square root of 77044440 is about 8777.4962261456. The cubic root of 77044440 is about 425.5139158011.

The spelling of 77044440 in words is "seventy-seven million, forty-four thousand, four hundred forty".