77712667648 has 88 divisors (see below), whose sum is σ = 193682620224. Its totient is φ = 30277632000.

The previous prime is 77712667633. The next prime is 77712667661. The reversal of 77712667648 is 84676621777.

It is a tau number, because it is divible by the number of its divisors (88).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413953 + ... + 571648.

Almost surely, 2^77712667648 is an apocalyptic number.

It is an amenable number.

77712667648 is an abundant number, since it is smaller than the sum of its proper divisors (115969952576).

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

77712667648 is a wasteful number, since it uses less digits than its factorization.

77712667648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985639 (or 985621 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 61.

The spelling of 77712667648 in words is "seventy-seven billion, seven hundred twelve million, six hundred sixty-seven thousand, six hundred forty-eight".