78505965 has 24 divisors (see below), whose sum is σ = 137723040. Its totient is φ = 41363424.

The previous prime is 78505951. The next prime is 78505993. The reversal of 78505965 is 56950587.

78505965 is a `hidden beast` number, since 7 + 8 + 50 + 596 + 5 = 666.

It is not a de Polignac number, because 78505965 - 2⁷ = 78505837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78505965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6775 + ... + 14244.

It is an arithmetic number, because the mean of its divisors is an integer number (5738460).

Almost surely, 2^78505965 is an apocalyptic number.

It is an amenable number.

78505965 is a deficient number, since it is larger than the sum of its proper divisors (59217075).

78505965 is a wasteful number, since it uses less digits than its factorization.

78505965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21113 (or 21110 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 78505965 is about 8860.3591913646. The cubic root of 78505965 is about 428.1877306272.

The spelling of 78505965 in words is "seventy-eight million, five hundred five thousand, nine hundred sixty-five".