78992405 has 16 divisors (see below), whose sum is σ = 100243200. Its totient is φ = 59590080.

The previous prime is 78992401. The next prime is 78992467. The reversal of 78992405 is 50429987.

It is a happy number.

It is not a de Polignac number, because 78992405 - 2² = 78992401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78992401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19940 + ... + 23570.

It is an arithmetic number, because the mean of its divisors is an integer number (6265200).

Almost surely, 2^78992405 is an apocalyptic number.

It is an amenable number.

78992405 is a deficient number, since it is larger than the sum of its proper divisors (21250795).

78992405 is a wasteful number, since it uses less digits than its factorization.

78992405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 78992405 is about 8887.7671549158. The cubic root of 78992405 is about 429.0702916573.

It can be divided in two parts, 78992 and 405, that added together give a palindrome (79397).

The spelling of 78992405 in words is "seventy-eight million, nine hundred ninety-two thousand, four hundred five".