61444840 has 16 divisors (see below), whose sum is σ = 138250980. Its totient is φ = 24577920.

The previous prime is 61444819. The next prime is 61444847. The reversal of 61444840 is 4844416.

61444840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51294244 + 10150596 = 7162^2 + 3186^2 .

It is not an unprimeable number, because it can be changed into a prime (61444847) 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 3 ways as a sum of consecutive naturals, for example, 768021 + ... + 768100.

Almost surely, 2^61444840 is an apocalyptic number.

It is an amenable number.

61444840 is an abundant number, since it is smaller than the sum of its proper divisors (76806140).

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

61444840 is a wasteful number, since it uses less digits than its factorization.

61444840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536132 (or 1536128 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 61444840 is about 7838.6759085958. The cubic root of 61444840 is about 394.6042931368.

It can be divided in two parts, 614 and 44840, that added together give a palindrome (45454).

The spelling of 61444840 in words is "sixty-one million, four hundred forty-four thousand, eight hundred forty".