77131866 has 16 divisors (see below), whose sum is σ = 176301504. Its totient is φ = 22037664.

The previous prime is 77131853. The next prime is 77131867. The reversal of 77131866 is 66813177.

It is not an unprimeable number, because it can be changed into a prime (77131867) 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, 918195 + ... + 918278.

It is an arithmetic number, because the mean of its divisors is an integer number (11018844).

Almost surely, 2^77131866 is an apocalyptic number.

77131866 is an abundant number, since it is smaller than the sum of its proper divisors (99169638).

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

77131866 is a wasteful number, since it uses less digits than its factorization.

77131866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836485.

The product of its digits is 42336, while the sum is 39.

The square root of 77131866 is about 8782.4749359164. The cubic root of 77131866 is about 425.6748052705.

The spelling of 77131866 in words is "seventy-seven million, one hundred thirty-one thousand, eight hundred sixty-six".