978809827877 has 12 divisors (see below), whose sum is σ = 1138646592000. Its totient is φ = 838956953016.

The previous prime is 978809827861. The next prime is 978809827913. The reversal of 978809827877 is 778728908879.

It is not a de Polignac number, because 978809827877 - 2⁴ = 978809827861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978809827837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1682588 + ... + 2188314.

It is an arithmetic number, because the mean of its divisors is an integer number (94887216000).

Almost surely, 2^978809827877 is an apocalyptic number.

It is an amenable number.

978809827877 is a deficient number, since it is larger than the sum of its proper divisors (159836764123).

978809827877 is a wasteful number, since it uses less digits than its factorization.

978809827877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545240 (or 545233 counting only the distinct ones).

The product of its (nonzero) digits is 1593188352, while the sum is 80.

The spelling of 978809827877 in words is "nine hundred seventy-eight billion, eight hundred nine million, eight hundred twenty-seven thousand, eight hundred seventy-seven".