68456381 has 6 divisors (see below), whose sum is σ = 79632990. Its totient is φ = 58676856.

The previous prime is 68456371. The next prime is 68456383. The reversal of 68456381 is 18365486.

It can be written as a sum of positive squares in only one way, i.e., 48511225 + 19945156 = 6965^2 + 4466^2 .

It is not a de Polignac number, because 68456381 - 2¹⁴ = 68439997 is a prime.

It is a super-2 number, since 2×68456381² = 9372552199234322, 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 (68456383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 698486 + ... + 698583.

It is an arithmetic number, because the mean of its divisors is an integer number (13272165).

Almost surely, 2^68456381 is an apocalyptic number.

It is an amenable number.

68456381 is a deficient number, since it is larger than the sum of its proper divisors (11176609).

68456381 is a wasteful number, since it uses less digits than its factorization.

68456381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397083 (or 1397076 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 68456381 is about 8273.8371388371. The cubic root of 68456381 is about 409.0766072232.

The spelling of 68456381 in words is "sixty-eight million, four hundred fifty-six thousand, three hundred eighty-one".