61500660 has 96 divisors (see below), whose sum is σ = 190549632. Its totient is φ = 14722560.

The previous prime is 61500629. The next prime is 61500661. The reversal of 61500660 is 6600516.

It is a self number, because there is not a number n which added to its sum of digits gives 61500660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61500661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27795 + ... + 29925.

It is an arithmetic number, because the mean of its divisors is an integer number (1984892).

Almost surely, 2^61500660 is an apocalyptic number.

61500660 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 61500660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95274816).

61500660 is an abundant number, since it is smaller than the sum of its proper divisors (129048972).

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

61500660 is a wasteful number, since it uses less digits than its factorization.

61500660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193 (or 2191 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 61500660 is about 7842.2356506292. The cubic root of 61500660 is about 394.7237506582.

The spelling of 61500660 in words is "sixty-one million, five hundred thousand, six hundred sixty".