61443728 has 20 divisors (see below), whose sum is σ = 119173548. Its totient is φ = 30689280.

The previous prime is 61443727. The next prime is 61443761. The reversal of 61443728 is 82734416.

It can be written as a sum of positive squares in 2 ways, for example, as 31719424 + 29724304 = 5632^2 + 5452^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61443727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22400 + ... + 24992.

Almost surely, 2^61443728 is an apocalyptic number.

It is an amenable number.

61443728 is a deficient number, since it is larger than the sum of its proper divisors (57729820).

61443728 is a wasteful number, since it uses less digits than its factorization.

61443728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082 (or 4076 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 61443728 is about 7838.6049779282. The cubic root of 61443728 is about 394.6019126678.

The spelling of 61443728 in words is "sixty-one million, four hundred forty-three thousand, seven hundred twenty-eight".