78870645 has 48 divisors (see below), whose sum is σ = 163120320. Its totient is φ = 36052128.

The previous prime is 78870637. The next prime is 78870689. The reversal of 78870645 is 54607887.

It is not a de Polignac number, because 78870645 - 2³ = 78870637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78870645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 654 + ... + 12576.

It is an arithmetic number, because the mean of its divisors is an integer number (3398340).

Almost surely, 2^78870645 is an apocalyptic number.

It is an amenable number.

78870645 is an abundant number, since it is smaller than the sum of its proper divisors (84249675).

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

78870645 is a wasteful number, since it uses less digits than its factorization.

78870645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11951 (or 11938 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 78870645 is about 8880.9146488411. The cubic root of 78870645 is about 428.8497199676.

The spelling of 78870645 in words is "seventy-eight million, eight hundred seventy thousand, six hundred forty-five".