61561368 has 96 divisors (see below), whose sum is σ = 191505600. Its totient is φ = 17668800.

The previous prime is 61561343. The next prime is 61561373. The reversal of 61561368 is 86316516.

It is a happy number.

61561368 is a `hidden beast` number, since 61 + 561 + 36 + 8 = 666.

61561368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 13003 + ... + 17093.

It is an arithmetic number, because the mean of its divisors is an integer number (1994850).

Almost surely, 2^61561368 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 61561368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95752800).

61561368 is an abundant number, since it is smaller than the sum of its proper divisors (129944232).

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

61561368 is a wasteful number, since it uses less digits than its factorization.

61561368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4133 (or 4126 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 61561368 is about 7846.1052758678. The cubic root of 61561368 is about 394.8535867125.

The spelling of 61561368 in words is "sixty-one million, five hundred sixty-one thousand, three hundred sixty-eight".