77745748920 has 64 divisors (see below), whose sum is σ = 266556856320. Its totient is φ = 17770456704.

The previous prime is 77745748891. The next prime is 77745748931. The reversal of 77745748920 is 2984754777.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 46276392 + ... + 46278071.

It is an arithmetic number, because the mean of its divisors is an integer number (4164950880).

Almost surely, 2^77745748920 is an apocalyptic number.

77745748920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77745748920 is an abundant number, since it is smaller than the sum of its proper divisors (188811107400).

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

77745748920 is a wasteful number, since it uses less digits than its factorization.

77745748920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92554484 (or 92554480 counting only the distinct ones).

The product of its (nonzero) digits is 27659520, while the sum is 60.

The spelling of 77745748920 in words is "seventy-seven billion, seven hundred forty-five million, seven hundred forty-eight thousand, nine hundred twenty".