78711997 has 8 divisors (see below), whose sum is σ = 96876416. Its totient is φ = 62277552.

The previous prime is 78711991. The next prime is 78712001. The reversal of 78711997 is 79911787.

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

It is a cyclic number.

It is not a de Polignac number, because 78711997 - 2⁷ = 78711869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78711997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78711991) 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, 432393 + ... + 432574.

It is an arithmetic number, because the mean of its divisors is an integer number (12109552).

Almost surely, 2^78711997 is an apocalyptic number.

It is an amenable number.

78711997 is a deficient number, since it is larger than the sum of its proper divisors (18164419).

78711997 is a wasteful number, since it uses less digits than its factorization.

78711997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864987.

The product of its digits is 222264, while the sum is 49.

The square root of 78711997 is about 8871.9781897838. The cubic root of 78711997 is about 428.5619837654.

The spelling of 78711997 in words is "seventy-eight million, seven hundred eleven thousand, nine hundred ninety-seven".