61304564 has 12 divisors (see below), whose sum is σ = 112929600. Its totient is φ = 29038968.

The previous prime is 61304563. The next prime is 61304569. The reversal of 61304564 is 46540316.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61304563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 403244 + ... + 403395.

It is an arithmetic number, because the mean of its divisors is an integer number (9410800).

Almost surely, 2^61304564 is an apocalyptic number.

It is an amenable number.

61304564 is a deficient number, since it is larger than the sum of its proper divisors (51625036).

61304564 is a wasteful number, since it uses less digits than its factorization.

61304564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806662 (or 806660 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 61304564 is about 7829.7231113239. The cubic root of 61304564 is about 394.3037759652.

The spelling of 61304564 in words is "sixty-one million, three hundred four thousand, five hundred sixty-four".