77647736540 has 48 divisors (see below), whose sum is σ = 177933611520. Its totient is φ = 28227650880.

The previous prime is 77647736477. The next prime is 77647736587. The reversal of 77647736540 is 4563774677.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770729 + ... + 865631.

It is an arithmetic number, because the mean of its divisors is an integer number (3706950240).

Almost surely, 2^77647736540 is an apocalyptic number.

It is an amenable number.

77647736540 is an abundant number, since it is smaller than the sum of its proper divisors (100285874980).

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

77647736540 is a wasteful number, since it uses less digits than its factorization.

77647736540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98642 (or 98640 counting only the distinct ones).

The product of its (nonzero) digits is 20744640, while the sum is 56.

The spelling of 77647736540 in words is "seventy-seven billion, six hundred forty-seven million, seven hundred thirty-six thousand, five hundred forty".