78500965 has 4 divisors (see below), whose sum is σ = 94201164. Its totient is φ = 62800768.

The previous prime is 78500927. The next prime is 78500977. The reversal of 78500965 is 56900587.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56900587 = 5431 ⋅10477.

It can be written as a sum of positive squares in 2 ways, for example, as 58277956 + 20223009 = 7634^2 + 4497^2 .

It is a cyclic number.

It is not a de Polignac number, because 78500965 - 2¹⁵ = 78468197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7850092 + ... + 7850101.

It is an arithmetic number, because the mean of its divisors is an integer number (23550291).

Almost surely, 2^78500965 is an apocalyptic number.

It is an amenable number.

78500965 is a deficient number, since it is larger than the sum of its proper divisors (15700199).

78500965 is a wasteful number, since it uses less digits than its factorization.

78500965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15700198.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 78500965 is about 8860.0770312678. The cubic root of 78500965 is about 428.1786400903.

The spelling of 78500965 in words is "seventy-eight million, five hundred thousand, nine hundred sixty-five".