68527981 has 4 divisors (see below), whose sum is σ = 68544864. Its totient is φ = 68511100.

The previous prime is 68527967. The next prime is 68528039. The reversal of 68527981 is 18972586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68527981 - 2⁹ = 68527469 is a prime.

It is a super-2 number, since 2×68527981² = 9392168359872722, 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 (68527951) 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, 1746 + ... + 11836.

It is an arithmetic number, because the mean of its divisors is an integer number (17136216).

Almost surely, 2^68527981 is an apocalyptic number.

It is an amenable number.

68527981 is a deficient number, since it is larger than the sum of its proper divisors (16883).

68527981 is a wasteful number, since it uses less digits than its factorization.

68527981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16882.

The product of its digits is 241920, while the sum is 46.

The square root of 68527981 is about 8278.1629000642. The cubic root of 68527981 is about 409.2191782002.

The spelling of 68527981 in words is "sixty-eight million, five hundred twenty-seven thousand, nine hundred eighty-one".