68621381 has 8 divisors (see below), whose sum is σ = 69800640. Its totient is φ = 67452192.

The previous prime is 68621327. The next prime is 68621393. The reversal of 68621381 is 18312686.

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

It is a cyclic number.

It is not a de Polignac number, because 68621381 - 2⁶ = 68621317 is a prime.

It is a super-2 number, since 2×68621381² = 9417787860694322, 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 (68621681) 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, 11921 + ... + 16713.

It is an arithmetic number, because the mean of its divisors is an integer number (8725080).

Almost surely, 2^68621381 is an apocalyptic number.

It is an amenable number.

68621381 is a deficient number, since it is larger than the sum of its proper divisors (1179259).

68621381 is a wasteful number, since it uses less digits than its factorization.

68621381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035.

The product of its digits is 13824, while the sum is 35.

The square root of 68621381 is about 8283.8023274339. The cubic root of 68621381 is about 409.4050084717.

The spelling of 68621381 in words is "sixty-eight million, six hundred twenty-one thousand, three hundred eighty-one".