61645060 has 48 divisors (see below), whose sum is σ = 143047296. Its totient is φ = 22195712.

The previous prime is 61645033. The next prime is 61645061. The reversal of 61645060 is 6054616.

It is a super-2 number, since 2×61645060² = 7600226844807200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61645061) 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, 3879 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (2980152).

Almost surely, 2^61645060 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61645060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71523648).

61645060 is an abundant number, since it is smaller than the sum of its proper divisors (81402236).

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

61645060 is a wasteful number, since it uses less digits than its factorization.

61645060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7932 (or 7930 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 61645060 is about 7851.4368111830. The cubic root of 61645060 is about 395.0324387182.

Adding to 61645060 its reverse (6054616), we get a palindrome (67699676).

The spelling of 61645060 in words is "sixty-one million, six hundred forty-five thousand, sixty".