77884597728 has 72 divisors (see below), whose sum is σ = 253124949168. Its totient is φ = 22252741632.

The previous prime is 77884597717. The next prime is 77884597753. The reversal of 77884597728 is 82779548877.

77884597728 is a `hidden beast` number, since 7 + 7 + 8 + 8 + 4 + 597 + 7 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

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 11 ways as a sum of consecutive naturals, for example, 19314601 + ... + 19318632.

It is an arithmetic number, because the mean of its divisors is an integer number (3515624294).

Almost surely, 2^77884597728 is an apocalyptic number.

It is an amenable number.

77884597728 is an abundant number, since it is smaller than the sum of its proper divisors (175240351440).

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

77884597728 is a wasteful number, since it uses less digits than its factorization.

77884597728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38633256 (or 38633245 counting only the distinct ones).

The product of its digits is 442552320, while the sum is 72.

The spelling of 77884597728 in words is "seventy-seven billion, eight hundred eighty-four million, five hundred ninety-seven thousand, seven hundred twenty-eight".