68881957 has 4 divisors (see below), whose sum is σ = 68929056. Its totient is φ = 68834860.

The previous prime is 68881933. The next prime is 68881961. The reversal of 68881957 is 75918886.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75918886 = 2 ⋅37959443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68881957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68881157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21283 + ... + 24304.

It is an arithmetic number, because the mean of its divisors is an integer number (17232264).

Almost surely, 2^68881957 is an apocalyptic number.

It is an amenable number.

68881957 is a deficient number, since it is larger than the sum of its proper divisors (47099).

68881957 is a wasteful number, since it uses less digits than its factorization.

68881957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47098.

The product of its digits is 967680, while the sum is 52.

The square root of 68881957 is about 8299.5154677849. The cubic root of 68881957 is about 409.9225651898.

The spelling of 68881957 in words is "sixty-eight million, eight hundred eighty-one thousand, nine hundred fifty-seven".