61125660 has 144 divisors (see below), whose sum is σ = 199049760. Its totient is φ = 15137280.

The previous prime is 61125637. The next prime is 61125703. The reversal of 61125660 is 6652116.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208474 + ... + 208766.

It is an arithmetic number, because the mean of its divisors is an integer number (1382290).

Almost surely, 2^61125660 is an apocalyptic number.

61125660 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 61125660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99524880).

61125660 is an abundant number, since it is smaller than the sum of its proper divisors (137924100).

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

61125660 is a wasteful number, since it uses less digits than its factorization.

61125660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61125660 is about 7818.2900943876. The cubic root of 61125660 is about 393.9198390520.

Adding to 61125660 its reverse (6652116), we get a palindrome (67777776).

The spelling of 61125660 in words is "sixty-one million, one hundred twenty-five thousand, six hundred sixty".