77481216 has 54 divisors (see below), whose sum is σ = 223404090. Its totient is φ = 25826304.

The previous prime is 77481211. The next prime is 77481269. The reversal of 77481216 is 61218477.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 22127616 = 7440^2 + 4704^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77481211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14511 + ... + 19118.

Almost surely, 2^77481216 is an apocalyptic number.

It is an amenable number.

77481216 is an abundant number, since it is smaller than the sum of its proper divisors (145922874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77481216 is a wasteful number, since it uses less digits than its factorization.

77481216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33651 (or 33634 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 77481216 is about 8802.3415066674. The cubic root of 77481216 is about 426.3165008916.

The spelling of 77481216 in words is "seventy-seven million, four hundred eighty-one thousand, two hundred sixteen".