78997267 has 4 divisors (see below), whose sum is σ = 79527600. Its totient is φ = 78466936.

The previous prime is 78997241. The next prime is 78997273. The reversal of 78997267 is 76279987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76279987 = 7 ⋅10897141.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78997267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78997277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264943 + ... + 265240.

It is an arithmetic number, because the mean of its divisors is an integer number (19881900).

Almost surely, 2^78997267 is an apocalyptic number.

78997267 is a deficient number, since it is larger than the sum of its proper divisors (530333).

78997267 is a wasteful number, since it uses less digits than its factorization.

78997267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530332.

The product of its digits is 2667168, while the sum is 55.

The square root of 78997267 is about 8888.0406727242. The cubic root of 78997267 is about 429.0790946005.

The spelling of 78997267 in words is "seventy-eight million, nine hundred ninety-seven thousand, two hundred sixty-seven".