68981839 has 4 divisors (see below), whose sum is σ = 69082360. Its totient is φ = 68881320.

The previous prime is 68981833. The next prime is 68981873. The reversal of 68981839 is 93818986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68981839 - 2⁷ = 68981711 is a prime.

It is a super-2 number, since 2×68981839² = 9516988223643842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68981833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49224 + ... + 50605.

It is an arithmetic number, because the mean of its divisors is an integer number (17270590).

Almost surely, 2^68981839 is an apocalyptic number.

68981839 is a deficient number, since it is larger than the sum of its proper divisors (100521).

68981839 is an equidigital number, since it uses as much as digits as its factorization.

68981839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100520.

The product of its digits is 746496, while the sum is 52.

The square root of 68981839 is about 8305.5306272387. The cubic root of 68981839 is about 410.1206050113.

It can be divided in two parts, 689 and 81839, that added together give a palindrome (82528).

The spelling of 68981839 in words is "sixty-eight million, nine hundred eighty-one thousand, eight hundred thirty-nine".