78195689 has 16 divisors (see below), whose sum is σ = 94355520. Its totient is φ = 63840960.

The previous prime is 78195683. The next prime is 78195703. The reversal of 78195689 is 98659187.

It is a cyclic number.

It is not a de Polignac number, because 78195689 - 2⁸ = 78195433 is a prime.

It is a super-2 number, since 2×78195689² = 12229131556369442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78195689.

It is not an unprimeable number, because it can be changed into a prime (78195683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2099 + ... + 12680.

It is an arithmetic number, because the mean of its divisors is an integer number (5897220).

Almost surely, 2^78195689 is an apocalyptic number.

It is an amenable number.

78195689 is a deficient number, since it is larger than the sum of its proper divisors (16159831).

78195689 is a wasteful number, since it uses less digits than its factorization.

78195689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14840.

The product of its digits is 1088640, while the sum is 53.

The square root of 78195689 is about 8842.8326343995. The cubic root of 78195689 is about 427.6228827235.

The spelling of 78195689 in words is "seventy-eight million, one hundred ninety-five thousand, six hundred eighty-nine".