78807140 has 24 divisors (see below), whose sum is σ = 166036920. Its totient is φ = 31419648.

The previous prime is 78807137. The next prime is 78807187. The reversal of 78807140 is 4170887.

It can be written as a sum of positive squares in 4 ways, for example, as 5943844 + 72863296 = 2438^2 + 8536^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78807140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35 + ... + 12554.

It is an arithmetic number, because the mean of its divisors is an integer number (6918205).

Almost surely, 2^78807140 is an apocalyptic number.

It is an amenable number.

78807140 is an abundant number, since it is smaller than the sum of its proper divisors (87229780).

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

78807140 is a wasteful number, since it uses less digits than its factorization.

78807140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12911 (or 12909 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 78807140 is about 8877.3385651331. The cubic root of 78807140 is about 428.7345887753.

The spelling of 78807140 in words is "seventy-eight million, eight hundred seven thousand, one hundred forty".