78738580 has 12 divisors (see below), whose sum is σ = 165351060. Its totient is φ = 31495424.

The previous prime is 78738559. The next prime is 78738587. The reversal of 78738580 is 8583787.

It can be written as a sum of positive squares in 2 ways, for example, as 19201924 + 59536656 = 4382^2 + 7716^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78738580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78738587) 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, 1968445 + ... + 1968484.

It is an arithmetic number, because the mean of its divisors is an integer number (13779255).

Almost surely, 2^78738580 is an apocalyptic number.

It is an amenable number.

78738580 is an abundant number, since it is smaller than the sum of its proper divisors (86612480).

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

78738580 is a wasteful number, since it uses less digits than its factorization.

78738580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936938 (or 3936936 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 78738580 is about 8873.4762072144. The cubic root of 78738580 is about 428.6102236839.

The spelling of 78738580 in words is "seventy-eight million, seven hundred thirty-eight thousand, five hundred eighty".