61443140 has 48 divisors (see below), whose sum is σ = 141329664. Its totient is φ = 22252800.

The previous prime is 61443139. The next prime is 61443163. The reversal of 61443140 is 4134416.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 80360 + ... + 81120.

It is an arithmetic number, because the mean of its divisors is an integer number (2944368).

Almost surely, 2^61443140 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 61443140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70664832).

61443140 is an abundant number, since it is smaller than the sum of its proper divisors (79886524).

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

61443140 is a wasteful number, since it uses less digits than its factorization.

61443140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 1146 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 61443140 is about 7838.5674711646. The cubic root of 61443140 is about 394.6006539189.

Adding to 61443140 its reverse (4134416), we get a palindrome (65577556).

The spelling of 61443140 in words is "sixty-one million, four hundred forty-three thousand, one hundred forty".