61005660 has 48 divisors (see below), whose sum is σ = 178246656. Its totient is φ = 15560512.

The previous prime is 61005643. The next prime is 61005667. The reversal of 61005660 is 6650016.

It is a self number, because there is not a number n which added to its sum of digits gives 61005660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61005667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20724 + ... + 23483.

It is an arithmetic number, because the mean of its divisors is an integer number (3713472).

Almost surely, 2^61005660 is an apocalyptic number.

61005660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61005660 is an abundant number, since it is smaller than the sum of its proper divisors (117240996).

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

61005660 is a wasteful number, since it uses less digits than its factorization.

61005660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44242 (or 44240 counting only the distinct ones).

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

The square root of 61005660 is about 7810.6120118721. The cubic root of 61005660 is about 393.6618931108.

Adding to 61005660 its reverse (6650016), we get a palindrome (67655676).

The spelling of 61005660 in words is "sixty-one million, five thousand, six hundred sixty".