77044389 has 4 divisors (see below), whose sum is σ = 102725856. Its totient is φ = 51362924.

The previous prime is 77044381. The next prime is 77044441. The reversal of 77044389 is 98344077.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77044389 - 2³ = 77044381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77044389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77044381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12840729 + ... + 12840734.

It is an arithmetic number, because the mean of its divisors is an integer number (25681464).

Almost surely, 2^77044389 is an apocalyptic number.

It is an amenable number.

77044389 is a deficient number, since it is larger than the sum of its proper divisors (25681467).

77044389 is a wasteful number, since it uses less digits than its factorization.

77044389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25681466.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 77044389 is about 8777.4933209886. The cubic root of 77044389 is about 425.5138219106.

The spelling of 77044389 in words is "seventy-seven million, forty-four thousand, three hundred eighty-nine".