78981881 has 8 divisors (see below), whose sum is σ = 91230624. Its totient is φ = 67577920.

The previous prime is 78981869. The next prime is 78981883. The reversal of 78981881 is 18818987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78981881 - 2²² = 74787577 is a prime.

It is a super-2 number, since 2×78981881² = 12476275052596322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78981883) 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, 210995 + ... + 211368.

It is an arithmetic number, because the mean of its divisors is an integer number (11403828).

Almost surely, 2^78981881 is an apocalyptic number.

It is an amenable number.

78981881 is a deficient number, since it is larger than the sum of its proper divisors (12248743).

78981881 is a wasteful number, since it uses less digits than its factorization.

78981881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422391.

The product of its digits is 258048, while the sum is 50.

The square root of 78981881 is about 8887.1750854813. The cubic root of 78981881 is about 429.0512360856.

It can be divided in two parts, 7898 and 1881, that added together give a palindrome (9779).

The spelling of 78981881 in words is "seventy-eight million, nine hundred eighty-one thousand, eight hundred eighty-one".