78531948500 has 48 divisors (see below), whose sum is σ = 171541690320. Its totient is φ = 31407667200.

The previous prime is 78531948413. The next prime is 78531948571. The reversal of 78531948500 is 584913587.

It can be written as a sum of positive squares in 8 ways, for example, as 31688272144 + 46843676356 = 178012^2 + 216434^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

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, 5128856 + ... + 5144144.

It is an arithmetic number, because the mean of its divisors is an integer number (3573785215).

Almost surely, 2^78531948500 is an apocalyptic number.

It is an amenable number.

78531948500 is an abundant number, since it is smaller than the sum of its proper divisors (93009741820).

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

78531948500 is a wasteful number, since it uses less digits than its factorization.

78531948500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25581 (or 25569 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 78531948500 in words is "seventy-eight billion, five hundred thirty-one million, nine hundred forty-eight thousand, five hundred".