61999872 has 144 divisors (see below), whose sum is σ = 185431680. Its totient is φ = 18227200.

The previous prime is 61999859. The next prime is 61999897. The reversal of 61999872 is 27899916.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346279 + ... + 346457.

It is an arithmetic number, because the mean of its divisors is an integer number (1287720).

Almost surely, 2^61999872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61999872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92715840).

61999872 is an abundant number, since it is smaller than the sum of its proper divisors (123431808).

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

61999872 is a wasteful number, since it uses less digits than its factorization.

61999872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 236 counting only the distinct ones).

The product of its digits is 489888, while the sum is 51.

The square root of 61999872 is about 7873.9997459995. Note that the first 3 decimals coincide. The cubic root of 61999872 is about 395.7888885968.

The spelling of 61999872 in words is "sixty-one million, nine hundred ninety-nine thousand, eight hundred seventy-two".