78696665 has 8 divisors (see below), whose sum is σ = 96632448. Its totient is φ = 61493040.

The previous prime is 78696661. The next prime is 78696713. The reversal of 78696665 is 56669687.

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

It is not a de Polignac number, because 78696665 - 2² = 78696661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78696661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182801 + ... + 183230.

It is an arithmetic number, because the mean of its divisors is an integer number (12079056).

Almost surely, 2^78696665 is an apocalyptic number.

It is an amenable number.

78696665 is a deficient number, since it is larger than the sum of its proper divisors (17935783).

78696665 is a wasteful number, since it uses less digits than its factorization.

78696665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366079.

The product of its digits is 3265920, while the sum is 53.

The square root of 78696665 is about 8871.1140788517. The cubic root of 78696665 is about 428.5341559913.

The spelling of 78696665 in words is "seventy-eight million, six hundred ninety-six thousand, six hundred sixty-five".