77739489 has 9 divisors (see below), whose sum is σ = 112328593. Its totient is φ = 51808692.

The previous prime is 77739463. The next prime is 77739491. The reversal of 77739489 is 98493777.

The square root of 77739489 is 8817.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 77739489 - 2²³ = 69350881 is a prime.

It is a super-2 number, since 2×77739489² = 12086856299962242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77739689) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24982 + ... + 27920.

Almost surely, 2^77739489 is an apocalyptic number.

77739489 is the 8817-th square number.

77739489 is the 4409-th centered octagonal number.

It is an amenable number.

77739489 is a deficient number, since it is larger than the sum of its proper divisors (34589104).

77739489 is an frugal number, since it uses more digits than its factorization.

77739489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5884 (or 2942 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The cubic root of 77739489 is about 426.7896647209.

The spelling of 77739489 in words is "seventy-seven million, seven hundred thirty-nine thousand, four hundred eighty-nine".