61998606 has 48 divisors (see below), whose sum is σ = 139236864. Its totient is φ = 19922112.

The previous prime is 61998589. The next prime is 61998611. The reversal of 61998606 is 60689916.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 84216 + ... + 84948.

It is an arithmetic number, because the mean of its divisors is an integer number (2900768).

Almost surely, 2^61998606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61998606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69618432).

61998606 is an abundant number, since it is smaller than the sum of its proper divisors (77238258).

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

61998606 is a wasteful number, since it uses less digits than its factorization.

61998606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 61998606 is about 7873.9193544257. The cubic root of 61998606 is about 395.7861946550.

It can be divided in two parts, 619 and 98606, that added together give a square (99225 = 315²).

The spelling of 61998606 in words is "sixty-one million, nine hundred ninety-eight thousand, six hundred six".