68661738 has 24 divisors (see below), whose sum is σ = 150088068. Its totient is φ = 22684032.

The previous prime is 68661737. The next prime is 68661787. The reversal of 68661738 is 83716686.

It can be written as a sum of positive squares in 2 ways, for example, as 64112049 + 4549689 = 8007^2 + 2133^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68661693 and 68661702.

It is not an unprimeable number, because it can be changed into a prime (68661731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14845 + ... + 18912.

Almost surely, 2^68661738 is an apocalyptic number.

68661738 is an abundant number, since it is smaller than the sum of its proper divisors (81426330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68661738 is a wasteful number, since it uses less digits than its factorization.

68661738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33878 (or 33875 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 68661738 is about 8286.2378676936. The cubic root of 68661738 is about 409.4852512947.

The spelling of 68661738 in words is "sixty-eight million, six hundred sixty-one thousand, seven hundred thirty-eight".