77916690 has 24 divisors (see below), whose sum is σ = 202583628. Its totient is φ = 20777760.

The previous prime is 77916667. The next prime is 77916721. The reversal of 77916690 is 9661977.

It can be written as a sum of positive squares in 2 ways, for example, as 71520849 + 6395841 = 8457^2 + 2529^2 .

It is a super-2 number, since 2×77916690² = 12142021161112200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432781 + ... + 432960.

Almost surely, 2^77916690 is an apocalyptic number.

77916690 is an abundant number, since it is smaller than the sum of its proper divisors (124666938).

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

77916690 is a wasteful number, since it uses less digits than its factorization.

77916690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865754 (or 865751 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 77916690 is about 8827.0431062729. The cubic root of 77916690 is about 427.1136963753.

It can be divided in two parts, 77916 and 690, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 77916690 in words is "seventy-seven million, nine hundred sixteen thousand, six hundred ninety".