78099255 has 32 divisors (see below), whose sum is σ = 149526720. Its totient is φ = 38448000.

The previous prime is 78099211. The next prime is 78099257. The reversal of 78099255 is 55299087.

It is a happy number.

It is not a de Polignac number, because 78099255 - 2⁷ = 78099127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78099255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78099257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20496 + ... + 24005.

It is an arithmetic number, because the mean of its divisors is an integer number (4672710).

Almost surely, 2^78099255 is an apocalyptic number.

78099255 is a deficient number, since it is larger than the sum of its proper divisors (71427465).

78099255 is a wasteful number, since it uses less digits than its factorization.

78099255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44528 (or 44522 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 78099255 is about 8837.3782877050. The cubic root of 78099255 is about 427.4470232906.

The spelling of 78099255 in words is "seventy-eight million, ninety-nine thousand, two hundred fifty-five".