61371720 has 96 divisors (see below), whose sum is σ = 200603520. Its totient is φ = 16272000.

The previous prime is 61371719. The next prime is 61371731. The reversal of 61371720 is 2717316.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81345 + ... + 82095.

It is an arithmetic number, because the mean of its divisors is an integer number (2089620).

Almost surely, 2^61371720 is an apocalyptic number.

61371720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61371720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100301760).

61371720 is an abundant number, since it is smaller than the sum of its proper divisors (139231800).

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

61371720 is a wasteful number, since it uses less digits than its factorization.

61371720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 61371720 is about 7834.0104671873. The cubic root of 61371720 is about 394.4477032653.

The spelling of 61371720 in words is "sixty-one million, three hundred seventy-one thousand, seven hundred twenty".