68523981 has 8 divisors (see below), whose sum is σ = 94312704. Its totient is φ = 44208960.

The previous prime is 68523971. The next prime is 68524003. The reversal of 68523981 is 18932586.

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

It is not a de Polignac number, because 68523981 - 2⁷ = 68523853 is a prime.

It is a super-2 number, since 2×68523981² = 9391071944176722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68523901) 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, 368316 + ... + 368501.

It is an arithmetic number, because the mean of its divisors is an integer number (11789088).

Almost surely, 2^68523981 is an apocalyptic number.

It is an amenable number.

68523981 is a deficient number, since it is larger than the sum of its proper divisors (25788723).

68523981 is a wasteful number, since it uses less digits than its factorization.

68523981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736851.

The product of its digits is 103680, while the sum is 42.

The square root of 68523981 is about 8277.9212970407. The cubic root of 68523981 is about 409.2112159608.

The spelling of 68523981 in words is "sixty-eight million, five hundred twenty-three thousand, nine hundred eighty-one".