77442489 has 12 divisors (see below), whose sum is σ = 113695972. Its totient is φ = 50781600.

The previous prime is 77442451. The next prime is 77442493. The reversal of 77442489 is 98424477.

It can be written as a sum of positive squares in 2 ways, for example, as 31270464 + 46172025 = 5592^2 + 6795^2 .

It is not a de Polignac number, because 77442489 - 2²⁰ = 76393913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77442439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69982 + ... + 71079.

Almost surely, 2^77442489 is an apocalyptic number.

It is an amenable number.

77442489 is a deficient number, since it is larger than the sum of its proper divisors (36253483).

77442489 is a wasteful number, since it uses less digits than its factorization.

77442489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141128 (or 141125 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 77442489 is about 8800.1414193182. The cubic root of 77442489 is about 426.2454612623.

The spelling of 77442489 in words is "seventy-seven million, four hundred forty-two thousand, four hundred eighty-nine".