61280660 has 24 divisors (see below), whose sum is σ = 147073920. Its totient is φ = 21010464.

The previous prime is 61280651. The next prime is 61280663. The reversal of 61280660 is 6608216.

It is a super-3 number, since 3×61280660³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61280663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218720 + ... + 218999.

It is an arithmetic number, because the mean of its divisors is an integer number (6128080).

Almost surely, 2^61280660 is an apocalyptic number.

It is an amenable number.

61280660 is an abundant number, since it is smaller than the sum of its proper divisors (85793260).

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

61280660 is a wasteful number, since it uses less digits than its factorization.

61280660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437735 (or 437733 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 61280660 is about 7828.1964717296. The cubic root of 61280660 is about 394.2525200599.

Adding to 61280660 its reverse (6608216), we get a palindrome (67888876).

The spelling of 61280660 in words is "sixty-one million, two hundred eighty thousand, six hundred sixty".