61281868 has 6 divisors (see below), whose sum is σ = 107243276. Its totient is φ = 30640932.

The previous prime is 61281863. The next prime is 61281877. The reversal of 61281868 is 86818216.

61281868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61281868.

It is not an unprimeable number, because it can be changed into a prime (61281863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7660230 + ... + 7660237.

Almost surely, 2^61281868 is an apocalyptic number.

It is an amenable number.

61281868 is a deficient number, since it is larger than the sum of its proper divisors (45961408).

61281868 is a wasteful number, since it uses less digits than its factorization.

61281868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15320471 (or 15320469 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 61281868 is about 7828.2736283296. The cubic root of 61281868 is about 394.2551106211.

The spelling of 61281868 in words is "sixty-one million, two hundred eighty-one thousand, eight hundred sixty-eight".