78870520 has 64 divisors (see below), whose sum is σ = 188272800. Its totient is φ = 29652480.

The previous prime is 78870509. The next prime is 78870521. The reversal of 78870520 is 2507887.

78870520 is a nontrivial binomial coefficient, being equal to C(12560, 2).

It is a self number, because there is not a number n which added to its sum of digits gives 78870520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78870521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118990 + ... + 119650.

Almost surely, 2^78870520 is an apocalyptic number.

78870520 is the 12559-th triangular number and also the 6280-th hexagonal number.

78870520 is the 4187-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78870520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94136400).

78870520 is an abundant number, since it is smaller than the sum of its proper divisors (109402280).

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

78870520 is a wasteful number, since it uses less digits than its factorization.

78870520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 78870520 is about 8880.9076112749. The cubic root of 78870520 is about 428.8494934100.

The spelling of 78870520 in words is "seventy-eight million, eight hundred seventy thousand, five hundred twenty".