78781479 has 16 divisors (see below), whose sum is σ = 122314752. Its totient is φ = 44167968.

The previous prime is 78781477. The next prime is 78781489. The reversal of 78781479 is 97418787.

It is not a de Polignac number, because 78781479 - 2¹ = 78781477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78781471) 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, 34279 + ... + 36504.

It is an arithmetic number, because the mean of its divisors is an integer number (7644672).

Almost surely, 2^78781479 is an apocalyptic number.

78781479 is a deficient number, since it is larger than the sum of its proper divisors (43533273).

78781479 is a wasteful number, since it uses less digits than its factorization.

78781479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70846.

The product of its digits is 790272, while the sum is 51.

The square root of 78781479 is about 8875.8931381580. The cubic root of 78781479 is about 428.6880491994.

The spelling of 78781479 in words is "seventy-eight million, seven hundred eighty-one thousand, four hundred seventy-nine".