61999998 has 8 divisors (see below), whose sum is σ = 124000008. Its totient is φ = 20666664.

The previous prime is 61999997. The next prime is 62000009. The reversal of 61999998 is 89999916.

It is a sphenic number, since it is the product of 3 distinct primes.

61999998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61999997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166661 + ... + 5166672.

It is an arithmetic number, because the mean of its divisors is an integer number (15500001).

Almost surely, 2^61999998 is an apocalyptic number.

61999998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61999998 is a wasteful number, since it uses less digits than its factorization.

61999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333338.

The product of its digits is 2834352, while the sum is 60.

The square root of 61999998 is about 7874.0077470117. The cubic root of 61999998 is about 395.7891567122.

The spelling of 61999998 in words is "sixty-one million, nine hundred ninety-nine thousand, nine hundred ninety-eight".