77481189 has 18 divisors (see below), whose sum is σ = 118891890. Its totient is φ = 48614016.

The previous prime is 77481179. The next prime is 77481191. The reversal of 77481189 is 98118477.

It can be written as a sum of positive squares in 3 ways, for example, as 11189025 + 66292164 = 3345^2 + 8142^2 .

It is not a de Polignac number, because 77481189 - 2¹¹ = 77479141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77481109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12294 + ... + 17495.

It is an arithmetic number, because the mean of its divisors is an integer number (6605105).

Almost surely, 2^77481189 is an apocalyptic number.

It is an amenable number.

77481189 is a deficient number, since it is larger than the sum of its proper divisors (41410701).

77481189 is a wasteful number, since it uses less digits than its factorization.

77481189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29829 (or 29809 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 77481189 is about 8802.3399729845. The cubic root of 77481189 is about 426.3164513719.

The spelling of 77481189 in words is "seventy-seven million, four hundred eighty-one thousand, one hundred eighty-nine".