61998868 has 12 divisors (see below), whose sum is σ = 112239540. Its totient is φ = 29930432.

The previous prime is 61998863. The next prime is 61998877. The reversal of 61998868 is 86889916.

It can be written as a sum of positive squares in 2 ways, for example, as 49168144 + 12830724 = 7012^2 + 3582^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61998863) 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, 267121 + ... + 267352.

It is an arithmetic number, because the mean of its divisors is an integer number (9353295).

Almost surely, 2^61998868 is an apocalyptic number.

It is an amenable number.

61998868 is a deficient number, since it is larger than the sum of its proper divisors (50240672).

61998868 is a wasteful number, since it uses less digits than its factorization.

61998868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534506 (or 534504 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The square root of 61998868 is about 7873.9359916118. The cubic root of 61998868 is about 395.7867521720.

The spelling of 61998868 in words is "sixty-one million, nine hundred ninety-eight thousand, eight hundred sixty-eight".