77990867040 has 48 divisors (see below), whose sum is σ = 245671232688. Its totient is φ = 20797564416.

The previous prime is 77990867039. The next prime is 77990867093. The reversal of 77990867040 is 4076809977.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81240007 + ... + 81240966.

It is an arithmetic number, because the mean of its divisors is an integer number (5118150681).

Almost surely, 2^77990867040 is an apocalyptic number.

It is an amenable number.

77990867040 is an abundant number, since it is smaller than the sum of its proper divisors (167680365648).

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

77990867040 is a wasteful number, since it uses less digits than its factorization.

77990867040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162480991 (or 162480983 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 57.

The spelling of 77990867040 in words is "seventy-seven billion, nine hundred ninety million, eight hundred sixty-seven thousand, forty".