61910720 has 84 divisors (see below), whose sum is σ = 154131264. Its totient is φ = 23662080.

The previous prime is 61910671. The next prime is 61910729. The reversal of 61910720 is 2701916.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 61910720.

It is not an unprimeable number, because it can be changed into a prime (61910729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 783641 + ... + 783719.

It is an arithmetic number, because the mean of its divisors is an integer number (1834896).

Almost surely, 2^61910720 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 61910720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77065632).

61910720 is an abundant number, since it is smaller than the sum of its proper divisors (92220544).

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

61910720 is an equidigital number, since it uses as much as digits as its factorization.

61910720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 61910720 is about 7868.3365459289. The cubic root of 61910720 is about 395.5990909079.

The spelling of 61910720 in words is "sixty-one million, nine hundred ten thousand, seven hundred twenty".