61816216 has 64 divisors (see below), whose sum is σ = 153031680. Its totient is φ = 22663680.

The previous prime is 61816207. The next prime is 61816231. The reversal of 61816216 is 61261816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7521 + ... + 13423.

It is an arithmetic number, because the mean of its divisors is an integer number (2391120).

Almost surely, 2^61816216 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 61816216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76515840).

61816216 is an abundant number, since it is smaller than the sum of its proper divisors (91215464).

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

61816216 is a wasteful number, since it uses less digits than its factorization.

61816216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5944 (or 5940 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 61816216 is about 7862.3289170576. The cubic root of 61816216 is about 395.3977001785.

The spelling of 61816216 in words is "sixty-one million, eight hundred sixteen thousand, two hundred sixteen".