61939220 has 48 divisors (see below), whose sum is σ = 149385600. Its totient is φ = 21131904.

The previous prime is 61939201. The next prime is 61939223. The reversal of 61939220 is 2293916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61939223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30806 + ... + 32754.

It is an arithmetic number, because the mean of its divisors is an integer number (3112200).

Almost surely, 2^61939220 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 61939220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74692800).

61939220 is an abundant number, since it is smaller than the sum of its proper divisors (87446380).

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

61939220 is a wasteful number, since it uses less digits than its factorization.

61939220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 2190 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 61939220 is about 7870.1473937913. The cubic root of 61939220 is about 395.6597849982.

The spelling of 61939220 in words is "sixty-one million, nine hundred thirty-nine thousand, two hundred twenty".