77828064573021 has 32 divisors (see below), whose sum is σ = 121096839782400. Its totient is φ = 44443270893168.

The previous prime is 77828064573011. The next prime is 77828064573037. The reversal of 77828064573021 is 12037546082877.

It is not a de Polignac number, because 77828064573021 - 2⁵ = 77828064572989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77828064573001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23901841 + ... + 26962086.

It is an arithmetic number, because the mean of its divisors is an integer number (3784276243200).

Almost surely, 2^{77828064573021} is an apocalyptic number.

It is an amenable number.

77828064573021 is a deficient number, since it is larger than the sum of its proper divisors (43268775209379).

77828064573021 is a wasteful number, since it uses less digits than its factorization.

77828064573021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50865438 (or 50865424 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 60.

The spelling of 77828064573021 in words is "seventy-seven trillion, eight hundred twenty-eight billion, sixty-four million, five hundred seventy-three thousand, twenty-one".