68864521 has 4 divisors (see below), whose sum is σ = 75124944. Its totient is φ = 62604100.

The previous prime is 68864513. The next prime is 68864563. The reversal of 68864521 is 12546886.

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 68864521 - 2³ = 68864513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68864321) 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, 3130195 + ... + 3130216.

It is an arithmetic number, because the mean of its divisors is an integer number (18781236).

Almost surely, 2^68864521 is an apocalyptic number.

It is an amenable number.

68864521 is a deficient number, since it is larger than the sum of its proper divisors (6260423).

68864521 is a wasteful number, since it uses less digits than its factorization.

68864521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6260422.

The product of its digits is 92160, while the sum is 40.

The square root of 68864521 is about 8298.4649785367. The cubic root of 68864521 is about 409.8879745494.

The spelling of 68864521 in words is "sixty-eight million, eight hundred sixty-four thousand, five hundred twenty-one".