61444728 has 48 divisors (see below), whose sum is σ = 171787200. Its totient is φ = 19820160.

The previous prime is 61444723. The next prime is 61444741. The reversal of 61444728 is 82744416.

61444728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 61444692 and 61444701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61444723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11533 + ... + 15996.

It is an arithmetic number, because the mean of its divisors is an integer number (3578900).

Almost surely, 2^61444728 is an apocalyptic number.

It is an amenable number.

61444728 is an abundant number, since it is smaller than the sum of its proper divisors (110342472).

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

61444728 is a wasteful number, since it uses less digits than its factorization.

61444728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27572 (or 27565 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 61444728 is about 7838.6687645288. The cubic root of 61444728 is about 394.6040533786.

The spelling of 61444728 in words is "sixty-one million, four hundred forty-four thousand, seven hundred twenty-eight".