78721695 has 48 divisors (see below), whose sum is σ = 149778720. Its totient is φ = 38009088.

The previous prime is 78721673. The next prime is 78721697. The reversal of 78721695 is 59612787.

It is not a de Polignac number, because 78721695 - 2⁸ = 78721439 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 78721695.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78721697) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29736 + ... + 32274.

It is an arithmetic number, because the mean of its divisors is an integer number (3120390).

Almost surely, 2^78721695 is an apocalyptic number.

78721695 is a deficient number, since it is larger than the sum of its proper divisors (71057025).

78721695 is a wasteful number, since it uses less digits than its factorization.

78721695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616 (or 2613 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 78721695 is about 8872.5247252403. The cubic root of 78721695 is about 428.5795838924.

The spelling of 78721695 in words is "seventy-eight million, seven hundred twenty-one thousand, six hundred ninety-five".