78767899 has 4 divisors (see below), whose sum is σ = 90020464. Its totient is φ = 67515336.

The previous prime is 78767879. The next prime is 78767917. The reversal of 78767899 is 99876787.

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

It is not a de Polignac number, because 78767899 - 2⁷ = 78767771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78767879) 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, 5626272 + ... + 5626285.

It is an arithmetic number, because the mean of its divisors is an integer number (22505116).

Almost surely, 2^78767899 is an apocalyptic number.

78767899 is a deficient number, since it is larger than the sum of its proper divisors (11252565).

78767899 is a wasteful number, since it uses less digits than its factorization.

78767899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11252564.

The product of its digits is 10668672, while the sum is 61.

The square root of 78767899 is about 8875.1281117514. The cubic root of 78767899 is about 428.6634160060.

It can be divided in two parts, 787 and 67899, that added together give a palindrome (68686).

The spelling of 78767899 in words is "seventy-eight million, seven hundred sixty-seven thousand, eight hundred ninety-nine".