78915085 has 8 divisors (see below), whose sum is σ = 94770936. Its totient is φ = 63083520.

The previous prime is 78915073. The next prime is 78915097. The reversal of 78915085 is 58051987.

It is an interprime number because it is at equal distance from previous prime (78915073) and next prime (78915097).

It can be written as a sum of positive squares in 4 ways, for example, as 7396 + 78907689 = 86^2 + 8883^2 .

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

It is not a de Polignac number, because 78915085 - 2⁹ = 78914573 is a prime.

It is a super-3 number, since 3×78915085³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2077 + ... + 12733.

It is an arithmetic number, because the mean of its divisors is an integer number (11846367).

Almost surely, 2^78915085 is an apocalyptic number.

It is an amenable number.

78915085 is a deficient number, since it is larger than the sum of its proper divisors (15855851).

78915085 is a wasteful number, since it uses less digits than its factorization.

78915085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12143.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 78915085 is about 8883.4162910448. The cubic root of 78915085 is about 428.9302505766.

The spelling of 78915085 in words is "seventy-eight million, nine hundred fifteen thousand, eighty-five".