78267899 has 4 divisors (see below), whose sum is σ = 79340136. Its totient is φ = 77195664.

The previous prime is 78267887. The next prime is 78267947. The reversal of 78267899 is 99876287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78267899 - 2²⁰ = 77219323 is a prime.

It is a super-2 number, since 2×78267899² = 12251728027748402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78267499) 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, 536009 + ... + 536154.

It is an arithmetic number, because the mean of its divisors is an integer number (19835034).

Almost surely, 2^78267899 is an apocalyptic number.

78267899 is a deficient number, since it is larger than the sum of its proper divisors (1072237).

78267899 is a wasteful number, since it uses less digits than its factorization.

78267899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072236.

The product of its digits is 3048192, while the sum is 56.

The square root of 78267899 is about 8846.9146599252. The cubic root of 78267899 is about 427.7544720248.

The spelling of 78267899 in words is "seventy-eight million, two hundred sixty-seven thousand, eight hundred ninety-nine".