77749986 has 16 divisors (see below), whose sum is σ = 160862400. Its totient is φ = 25022928.

The previous prime is 77749979. The next prime is 77750017. The reversal of 77749986 is 68994777.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 223246 + ... + 223593.

It is an arithmetic number, because the mean of its divisors is an integer number (10053900).

Almost surely, 2^77749986 is an apocalyptic number.

77749986 is an abundant number, since it is smaller than the sum of its proper divisors (83112414).

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

77749986 is a wasteful number, since it uses less digits than its factorization.

77749986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446873.

The product of its digits is 5334336, while the sum is 57.

The square root of 77749986 is about 8817.5952504070. The cubic root of 77749986 is about 426.8088733605.

The spelling of 77749986 in words is "seventy-seven million, seven hundred forty-nine thousand, nine hundred eighty-six".