61573664 has 48 divisors (see below), whose sum is σ = 124185600. Its totient is φ = 30046464.

The previous prime is 61573663. The next prime is 61573667. The reversal of 61573664 is 46637516.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61573663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442907 + ... + 443045.

It is an arithmetic number, because the mean of its divisors is an integer number (2587200).

Almost surely, 2^61573664 is an apocalyptic number.

It is an amenable number.

61573664 is an abundant number, since it is smaller than the sum of its proper divisors (62611936).

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

61573664 is a wasteful number, since it uses less digits than its factorization.

61573664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 377 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 61573664 is about 7846.8888102228. Note that the first 4 decimals coincide. The cubic root of 61573664 is about 394.8798737420.

The spelling of 61573664 in words is "sixty-one million, five hundred seventy-three thousand, six hundred sixty-four".