68881397 has 16 divisors (see below), whose sum is σ = 76068720. Its totient is φ = 61980672.

The previous prime is 68881387. The next prime is 68881429. The reversal of 68881397 is 79318886.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 835396 + 68046001 = 914^2 + 8249^2 .

It is not a de Polignac number, because 68881397 - 2⁴ = 68881381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68881387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176879 + ... + 177267.

It is an arithmetic number, because the mean of its divisors is an integer number (4754295).

Almost surely, 2^68881397 is an apocalyptic number.

It is an amenable number.

68881397 is a deficient number, since it is larger than the sum of its proper divisors (7187323).

68881397 is a wasteful number, since it uses less digits than its factorization.

68881397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its digits is 580608, while the sum is 50.

The square root of 68881397 is about 8299.4817308071. The cubic root of 68881397 is about 409.9214543171.

The spelling of 68881397 in words is "sixty-eight million, eight hundred eighty-one thousand, three hundred ninety-seven".