78195651 has 8 divisors (see below), whose sum is σ = 106803984. Its totient is φ = 50858880.

The previous prime is 78195641. The next prime is 78195679. The reversal of 78195651 is 15659187.

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

It is not a de Polignac number, because 78195651 - 2⁶ = 78195587 is a prime.

It is a super-2 number, since 2×78195651² = 12229119670627602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78195641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317746 + ... + 317991.

It is an arithmetic number, because the mean of its divisors is an integer number (13350498).

Almost surely, 2^78195651 is an apocalyptic number.

78195651 is a deficient number, since it is larger than the sum of its proper divisors (28608333).

78195651 is a wasteful number, since it uses less digits than its factorization.

78195651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635781.

The product of its digits is 75600, while the sum is 42.

The square root of 78195651 is about 8842.8304857664. The cubic root of 78195651 is about 427.6228134542.

Subtracting from 78195651 its reverse (15659187), we obtain a square (62536464 = 7908²).

The spelling of 78195651 in words is "seventy-eight million, one hundred ninety-five thousand, six hundred fifty-one".