78597140 has 12 divisors (see below), whose sum is σ = 165054036. Its totient is φ = 31438848.

The previous prime is 78597131. The next prime is 78597143. The reversal of 78597140 is 4179587.

It can be written as a sum of positive squares in 2 ways, for example, as 57547396 + 21049744 = 7586^2 + 4588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78597143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1964909 + ... + 1964948.

It is an arithmetic number, because the mean of its divisors is an integer number (13754503).

Almost surely, 2^78597140 is an apocalyptic number.

It is an amenable number.

78597140 is an abundant number, since it is smaller than the sum of its proper divisors (86456896).

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

78597140 is a wasteful number, since it uses less digits than its factorization.

78597140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929866 (or 3929864 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 78597140 is about 8865.5028058199. The cubic root of 78597140 is about 428.3534289182.

The spelling of 78597140 in words is "seventy-eight million, five hundred ninety-seven thousand, one hundred forty".