78504993 has 24 divisors (see below), whose sum is σ = 132357888. Its totient is φ = 43903872.

The previous prime is 78504991. The next prime is 78505061. The reversal of 78504993 is 39940587.

It is not a de Polignac number, because 78504993 - 2¹ = 78504991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78504991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10296 + ... + 16217.

It is an arithmetic number, because the mean of its divisors is an integer number (5514912).

Almost surely, 2^78504993 is an apocalyptic number.

It is an amenable number.

78504993 is a deficient number, since it is larger than the sum of its proper divisors (53852895).

78504993 is a wasteful number, since it uses less digits than its factorization.

78504993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26573 (or 26570 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 78504993 is about 8860.3043401454. The cubic root of 78504993 is about 428.1859634571.

It can be divided in two parts, 78504 and 993, that added together give a palindrome (79497).

The spelling of 78504993 in words is "seventy-eight million, five hundred four thousand, nine hundred ninety-three".