77977313880 has 64 divisors (see below), whose sum is σ = 234047404800. Its totient is φ = 20783687040.

The previous prime is 77977313867. The next prime is 77977313993. The reversal of 77977313880 is 8831377977.

It is a super-2 number, since 2×77977313880² (a number of 23 digits) contains 22 as substring.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85335 + ... + 404025.

It is an arithmetic number, because the mean of its divisors is an integer number (3656990700).

Almost surely, 2^77977313880 is an apocalyptic number.

It is an amenable number.

77977313880 is an abundant number, since it is smaller than the sum of its proper divisors (156070090920).

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

77977313880 is a wasteful number, since it uses less digits than its factorization.

77977313880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320744 (or 320740 counting only the distinct ones).

The product of its (nonzero) digits is 12446784, while the sum is 60.

The spelling of 77977313880 in words is "seventy-seven billion, nine hundred seventy-seven million, three hundred thirteen thousand, eight hundred eighty".