78438759 has 24 divisors (see below), whose sum is σ = 122936688. Its totient is φ = 44352000.

The previous prime is 78438757. The next prime is 78438803. The reversal of 78438759 is 95783487.

It is not a de Polignac number, because 78438759 - 2¹ = 78438757 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78438757) 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, 11509 + ... + 17009.

It is an arithmetic number, because the mean of its divisors is an integer number (5122362).

Almost surely, 2^78438759 is an apocalyptic number.

78438759 is a deficient number, since it is larger than the sum of its proper divisors (44497929).

78438759 is a wasteful number, since it uses less digits than its factorization.

78438759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615 (or 5608 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 51.

The square root of 78438759 is about 8856.5658694553. The cubic root of 78438759 is about 428.0655106146.

It can be divided in two parts, 78438 and 759, that added together give a palindrome (79197).

The spelling of 78438759 in words is "seventy-eight million, four hundred thirty-eight thousand, seven hundred fifty-nine".