68881457 has 4 divisors (see below), whose sum is σ = 70743156. Its totient is φ = 67019760.

The previous prime is 68881453. The next prime is 68881471. The reversal of 68881457 is 75418886.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55368481 + 13512976 = 7441^2 + 3676^2 .

It is a cyclic number.

It is not a de Polignac number, because 68881457 - 2² = 68881453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68881453) 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, 930794 + ... + 930867.

It is an arithmetic number, because the mean of its divisors is an integer number (17685789).

Almost surely, 2^68881457 is an apocalyptic number.

It is an amenable number.

68881457 is a deficient number, since it is larger than the sum of its proper divisors (1861699).

68881457 is a wasteful number, since it uses less digits than its factorization.

68881457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861698.

The product of its digits is 430080, while the sum is 47.

The square root of 68881457 is about 8299.4853454898. The cubic root of 68881457 is about 409.9215733394.

The spelling of 68881457 in words is "sixty-eight million, eight hundred eighty-one thousand, four hundred fifty-seven".