61445616 has 80 divisors (see below), whose sum is σ = 169301664. Its totient is φ = 19136512.

The previous prime is 61445611. The next prime is 61445623. The reversal of 61445616 is 61654416.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445611) 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, 209566 + ... + 209858.

Almost surely, 2^61445616 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 61445616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84650832).

61445616 is an abundant number, since it is smaller than the sum of its proper divisors (107856048).

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

61445616 is a wasteful number, since it uses less digits than its factorization.

61445616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 572 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 61445616 is about 7838.7254065951. The cubic root of 61445616 is about 394.6059543104.

The spelling of 61445616 in words is "sixty-one million, four hundred forty-five thousand, six hundred sixteen".