61999992 has 56 divisors (see below), whose sum is σ = 174311640. Its totient is φ = 20664720.

The previous prime is 61999967. The next prime is 61999997. The reversal of 61999992 is 29999916.

It is a happy number.

61999992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

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

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 517 + ... + 11147.

Almost surely, 2^61999992 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 61999992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87155820).

61999992 is an abundant number, since it is smaller than the sum of its proper divisors (112311648).

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

61999992 is a wasteful number, since it uses less digits than its factorization.

61999992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10655 (or 10636 counting only the distinct ones).

The product of its digits is 708588, while the sum is 54.

The square root of 61999992 is about 7874.0073660113. The cubic root of 61999992 is about 395.7891439449.

The spelling of 61999992 in words is "sixty-one million, nine hundred ninety-nine thousand, nine hundred ninety-two".