68139954 has 40 divisors (see below), whose sum is σ = 154150128. Its totient is φ = 22495320.

The previous prime is 68139923. The next prime is 68139983. The reversal of 68139954 is 45993186.

It is a happy number.

It is a super-2 number, since 2×68139954² = 9286106662244232, which contains 22 as substring.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15369 + ... + 19299.

Almost surely, 2^68139954 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68139954, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77075064).

68139954 is an abundant number, since it is smaller than the sum of its proper divisors (86010174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68139954 is a wasteful number, since it uses less digits than its factorization.

68139954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052 (or 4043 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 68139954 is about 8254.6928471022. The cubic root of 68139954 is about 408.4453398507.

The spelling of 68139954 in words is "sixty-eight million, one hundred thirty-nine thousand, nine hundred fifty-four".