78585715 has 16 divisors (see below), whose sum is σ = 101965248. Its totient is φ = 57799296.

The previous prime is 78585677. The next prime is 78585719. The reversal of 78585715 is 51758587.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78585715 - 2⁷ = 78585587 is a prime.

It is a super-2 number, since 2×78585715² = 12351429204122450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78585719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14797 + ... + 19393.

It is an arithmetic number, because the mean of its divisors is an integer number (6372828).

Almost surely, 2^78585715 is an apocalyptic number.

78585715 is a deficient number, since it is larger than the sum of its proper divisors (23379533).

78585715 is a wasteful number, since it uses less digits than its factorization.

78585715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878.

The product of its digits is 392000, while the sum is 46.

The square root of 78585715 is about 8864.8584309057. The cubic root of 78585715 is about 428.3326725434.

The spelling of 78585715 in words is "seventy-eight million, five hundred eighty-five thousand, seven hundred fifteen".