78992505 has 24 divisors (see below), whose sum is σ = 140107968. Its totient is φ = 41148576.

The previous prime is 78992483. The next prime is 78992513. The reversal of 78992505 is 50529987.

It is a happy number.

It is not a de Polignac number, because 78992505 - 2¹⁰ = 78991481 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18477 + ... + 22346.

It is an arithmetic number, because the mean of its divisors is an integer number (5837832).

Almost surely, 2^78992505 is an apocalyptic number.

It is an amenable number.

78992505 is a deficient number, since it is larger than the sum of its proper divisors (61115463).

78992505 is a wasteful number, since it uses less digits than its factorization.

78992505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40877 (or 40874 counting only the distinct ones).

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

The square root of 78992505 is about 8887.7727806240. The cubic root of 78992505 is about 429.0704727169.

It can be divided in two parts, 78992 and 505, that added together give a palindrome (79497).

The spelling of 78992505 in words is "seventy-eight million, nine hundred ninety-two thousand, five hundred five".