61005564 has 18 divisors (see below), whose sum is σ = 154208600. Its totient is φ = 20335176.

The previous prime is 61005559. The next prime is 61005629. The reversal of 61005564 is 46550016.

It is a happy number.

61005564 is a `hidden beast` number, since 6 + 100 + 556 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 847264 + ... + 847335.

Almost surely, 2^61005564 is an apocalyptic number.

It is an amenable number.

61005564 is an abundant number, since it is smaller than the sum of its proper divisors (93203036).

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

61005564 is a wasteful number, since it uses less digits than its factorization.

61005564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694609 (or 1694604 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 61005564 is about 7810.6058663845. The cubic root of 61005564 is about 393.6616866186.

It can be divided in two parts, 6100 and 5564, that added together give a square (11664 = 108²).

The spelling of 61005564 in words is "sixty-one million, five thousand, five hundred sixty-four".