78715730 has 8 divisors (see below), whose sum is σ = 141688332. Its totient is φ = 31486288.

The previous prime is 78715723. The next prime is 78715733. The reversal of 78715730 is 3751787.

It can be written as a sum of positive squares in 2 ways, for example, as 77598481 + 1117249 = 8809^2 + 1057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78715730² = 12392332298865800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78715733) 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, 3935777 + ... + 3935796.

Almost surely, 2^78715730 is an apocalyptic number.

78715730 is a deficient number, since it is larger than the sum of its proper divisors (62972602).

78715730 is a wasteful number, since it uses less digits than its factorization.

78715730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7871580.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 78715730 is about 8872.1885687805. The cubic root of 78715730 is about 428.5687586606.

The spelling of 78715730 in words is "seventy-eight million, seven hundred fifteen thousand, seven hundred thirty".