77664140 has 12 divisors (see below), whose sum is σ = 163094736. Its totient is φ = 31065648.

The previous prime is 77664113. The next prime is 77664151. The reversal of 77664140 is 4146677.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 77664140.

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 3 ways as a sum of consecutive naturals, for example, 1941584 + ... + 1941623.

It is an arithmetic number, because the mean of its divisors is an integer number (13591228).

Almost surely, 2^77664140 is an apocalyptic number.

It is an amenable number.

77664140 is an abundant number, since it is smaller than the sum of its proper divisors (85430596).

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

77664140 is a wasteful number, since it uses less digits than its factorization.

77664140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3883216 (or 3883214 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 77664140 is about 8812.7260254702. The cubic root of 77664140 is about 426.6517315193.

The spelling of 77664140 in words is "seventy-seven million, six hundred sixty-four thousand, one hundred forty".