77761089 has 18 divisors (see below), whose sum is σ = 130660530. Its totient is φ = 44434656.

The previous prime is 77761081. The next prime is 77761097. The reversal of 77761089 is 98016777.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77761081) and next prime (77761097).

It can be written as a sum of positive squares in only one way, i.e., 53406864 + 24354225 = 7308^2 + 4935^2 .

It is not a de Polignac number, because 77761089 - 2³ = 77761081 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77761081) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 87724 + ... + 88605.

Almost surely, 2^77761089 is an apocalyptic number.

It is an amenable number.

77761089 is a deficient number, since it is larger than the sum of its proper divisors (52899441).

77761089 is a wasteful number, since it uses less digits than its factorization.

77761089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176349 (or 176339 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 77761089 is about 8818.2248213572. The cubic root of 77761089 is about 426.8291890484.

The spelling of 77761089 in words is "seventy-seven million, seven hundred sixty-one thousand, eighty-nine".