61365856 has 48 divisors (see below), whose sum is σ = 126554400. Its totient is φ = 29252608.

The previous prime is 61365853. The next prime is 61365901. The reversal of 61365856 is 65856316.

It is a super-2 number, since 2×61365856² = 7531536565225472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61365853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82221 + ... + 82963.

It is an arithmetic number, because the mean of its divisors is an integer number (2636550).

Almost surely, 2^61365856 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 61365856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63277200).

61365856 is an abundant number, since it is smaller than the sum of its proper divisors (65188544).

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

61365856 is a wasteful number, since it uses less digits than its factorization.

61365856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871 (or 863 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 61365856 is about 7833.6361927268. The cubic root of 61365856 is about 394.4351398512.

The spelling of 61365856 in words is "sixty-one million, three hundred sixty-five thousand, eight hundred fifty-six".