68628861 has 18 divisors (see below), whose sum is σ = 115315902. Its totient is φ = 39216240.

The previous prime is 68628841. The next prime is 68628869. The reversal of 68628861 is 16882686.

It can be written as a sum of positive squares in only one way, i.e., 65367225 + 3261636 = 8085^2 + 1806^2 .

It is not a de Polignac number, because 68628861 - 2¹⁵ = 68596093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68628869) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 77370 + ... + 78251.

It is an arithmetic number, because the mean of its divisors is an integer number (6406439).

Almost surely, 2^68628861 is an apocalyptic number.

It is an amenable number.

68628861 is a deficient number, since it is larger than the sum of its proper divisors (46687041).

68628861 is a wasteful number, since it uses less digits than its factorization.

68628861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155641 (or 155631 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 68628861 is about 8284.2537986230. The cubic root of 68628861 is about 409.4198835158.

The spelling of 68628861 in words is "sixty-eight million, six hundred twenty-eight thousand, eight hundred sixty-one".