61645472 has 48 divisors (see below), whose sum is σ = 139708800. Its totient is φ = 26227968.

The previous prime is 61645471. The next prime is 61645627. The reversal of 61645472 is 27454616.

It is not an unprimeable number, because it can be changed into a prime (61645471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32453 + ... + 34299.

It is an arithmetic number, because the mean of its divisors is an integer number (2910600).

Almost surely, 2^61645472 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 61645472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69854400).

61645472 is an abundant number, since it is smaller than the sum of its proper divisors (78063328).

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

61645472 is a wasteful number, since it uses less digits than its factorization.

61645472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013 (or 2005 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 61645472 is about 7851.4630483751. The cubic root of 61645472 is about 395.0333187725.

The spelling of 61645472 in words is "sixty-one million, six hundred forty-five thousand, four hundred seventy-two".