61561568 has 24 divisors (see below), whose sum is σ = 121455432. Its totient is φ = 30715776.

The previous prime is 61561561. The next prime is 61561579. The reversal of 61561568 is 86516516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15746 + ... + 19262.

It is an arithmetic number, because the mean of its divisors is an integer number (5060643).

Almost surely, 2^61561568 is an apocalyptic number.

It is an amenable number.

61561568 is a deficient number, since it is larger than the sum of its proper divisors (59893864).

61561568 is a wasteful number, since it uses less digits than its factorization.

61561568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074 (or 4066 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 61561568 is about 7846.1180210344. The cubic root of 61561568 is about 394.8540143110.

The spelling of 61561568 in words is "sixty-one million, five hundred sixty-one thousand, five hundred sixty-eight".