78130715 has 16 divisors (see below), whose sum is σ = 101189088. Its totient is φ = 57570816.

The previous prime is 78130711. The next prime is 78130729. The reversal of 78130715 is 51703187.

It is a cyclic number.

It is not a de Polignac number, because 78130715 - 2² = 78130711 is a prime.

It is a super-2 number, since 2×78130715² = 12208817252822450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78130711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37532 + ... + 39558.

It is an arithmetic number, because the mean of its divisors is an integer number (6324318).

Almost surely, 2^78130715 is an apocalyptic number.

78130715 is a deficient number, since it is larger than the sum of its proper divisors (23058373).

78130715 is a wasteful number, since it uses less digits than its factorization.

78130715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 78130715 is about 8839.1580481401. The cubic root of 78130715 is about 427.5044104284.

The spelling of 78130715 in words is "seventy-eight million, one hundred thirty thousand, seven hundred fifteen".