77481636 has 24 divisors (see below), whose sum is σ = 185201184. Its totient is φ = 25197120.

The previous prime is 77481629. The next prime is 77481637. The reversal of 77481636 is 63618477.

It is not an unprimeable number, because it can be changed into a prime (77481637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78250 + ... + 79233.

It is an arithmetic number, because the mean of its divisors is an integer number (7716716).

Almost surely, 2^77481636 is an apocalyptic number.

It is an amenable number.

77481636 is an abundant number, since it is smaller than the sum of its proper divisors (107719548).

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

77481636 is a wasteful number, since it uses less digits than its factorization.

77481636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157531 (or 157529 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 77481636 is about 8802.3653639235. The cubic root of 77481636 is about 426.3172711971.

The spelling of 77481636 in words is "seventy-seven million, four hundred eighty-one thousand, six hundred thirty-six".