78599420 has 24 divisors (see below), whose sum is σ = 165343248. Its totient is φ = 31385600.

The previous prime is 78599407. The next prime is 78599429. The reversal of 78599420 is 2499587.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78599429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9755 + ... + 15885.

It is an arithmetic number, because the mean of its divisors is an integer number (6889302).

Almost surely, 2^78599420 is an apocalyptic number.

It is an amenable number.

78599420 is an abundant number, since it is smaller than the sum of its proper divisors (86743828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78599420 is a wasteful number, since it uses less digits than its factorization.

78599420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781 (or 6779 counting only the distinct ones).

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

The square root of 78599420 is about 8865.6313931947. The cubic root of 78599420 is about 428.3575708686.

The spelling of 78599420 in words is "seventy-eight million, five hundred ninety-nine thousand, four hundred twenty".