61445530 has 32 divisors (see below), whose sum is σ = 115240320. Its totient is φ = 23567040.

The previous prime is 61445473. The next prime is 61445539. The reversal of 61445530 is 3554416.

It is not an unprimeable number, because it can be changed into a prime (61445539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25101 + ... + 27439.

It is an arithmetic number, because the mean of its divisors is an integer number (3601260).

Almost surely, 2^61445530 is an apocalyptic number.

61445530 is a deficient number, since it is larger than the sum of its proper divisors (53794790).

61445530 is a wasteful number, since it uses less digits than its factorization.

61445530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 61445530 is about 7838.7199210075. The cubic root of 61445530 is about 394.6057702120.

Adding to 61445530 its reverse (3554416), we get a palindrome (64999946).

The spelling of 61445530 in words is "sixty-one million, four hundred forty-five thousand, five hundred thirty".