78107997 has 16 divisors (see below), whose sum is σ = 115310592. Its totient is φ = 46630320.

The previous prime is 78107969. The next prime is 78108001. The reversal of 78107997 is 79970187.

It is not a de Polignac number, because 78107997 - 2¹⁸ = 77845853 is a prime.

It is a super-2 number, since 2×78107997² = 12201718390704018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78107927) 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, 15453 + ... + 19874.

It is an arithmetic number, because the mean of its divisors is an integer number (7206912).

Almost surely, 2^78107997 is an apocalyptic number.

It is an amenable number.

78107997 is a deficient number, since it is larger than the sum of its proper divisors (37202595).

78107997 is a wasteful number, since it uses less digits than its factorization.

78107997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35408.

The product of its (nonzero) digits is 222264, while the sum is 48.

The square root of 78107997 is about 8837.8728775651. The cubic root of 78107997 is about 427.4629713833.

The spelling of 78107997 in words is "seventy-eight million, one hundred seven thousand, nine hundred ninety-seven".