78881439 has 32 divisors (see below), whose sum is σ = 130031104. Its totient is φ = 41420160.

The previous prime is 78881431. The next prime is 78881441. The reversal of 78881439 is 93418887.

It is not a de Polignac number, because 78881439 - 2³ = 78881431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78881431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76749 + ... + 77769.

It is an arithmetic number, because the mean of its divisors is an integer number (4063472).

Almost surely, 2^78881439 is an apocalyptic number.

78881439 is a deficient number, since it is larger than the sum of its proper divisors (51149665).

78881439 is a wasteful number, since it uses less digits than its factorization.

78881439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327.

The product of its digits is 387072, while the sum is 48.

The square root of 78881439 is about 8881.5223357260. The cubic root of 78881439 is about 428.8692827708.

The spelling of 78881439 in words is "seventy-eight million, eight hundred eighty-one thousand, four hundred thirty-nine".