61974564 has 12 divisors (see below), whose sum is σ = 144607344. Its totient is φ = 20658184.

The previous prime is 61974541. The next prime is 61974629. The reversal of 61974564 is 46547916.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2582262 + ... + 2582285.

It is an arithmetic number, because the mean of its divisors is an integer number (12050612).

Almost surely, 2^61974564 is an apocalyptic number.

It is an amenable number.

61974564 is an abundant number, since it is smaller than the sum of its proper divisors (82632780).

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

61974564 is a wasteful number, since it uses less digits than its factorization.

61974564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5164554 (or 5164552 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 61974564 is about 7872.3925207017. The cubic root of 61974564 is about 395.7350283329.

The spelling of 61974564 in words is "sixty-one million, nine hundred seventy-four thousand, five hundred sixty-four".