61660260 has 72 divisors (see below), whose sum is σ = 187682040. Its totient is φ = 16386048.

The previous prime is 61660243. The next prime is 61660279. The reversal of 61660260 is 6206616.

It can be written as a sum of positive squares in 4 ways, for example, as 9474084 + 52186176 = 3078^2 + 7224^2 .

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, 91284 + ... + 91956.

It is an arithmetic number, because the mean of its divisors is an integer number (2606695).

Almost surely, 2^61660260 is an apocalyptic number.

61660260 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 61660260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93841020).

61660260 is an abundant number, since it is smaller than the sum of its proper divisors (126021780).

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

61660260 is a wasteful number, since it uses less digits than its factorization.

61660260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61660260 is about 7852.4047272157. The cubic root of 61660260 is about 395.0649041454.

Adding to 61660260 its reverse (6206616), we get a palindrome (67866876).

The spelling of 61660260 in words is "sixty-one million, six hundred sixty thousand, two hundred sixty".