61643464 has 8 divisors (see below), whose sum is σ = 115581510. Its totient is φ = 30821728.

The previous prime is 61643423. The next prime is 61643471. The reversal of 61643464 is 46434616.

61643464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 46104100 + 15539364 = 6790^2 + 3942^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3852709 + ... + 3852724.

Almost surely, 2^61643464 is an apocalyptic number.

It is an amenable number.

61643464 is a deficient number, since it is larger than the sum of its proper divisors (53938046).

61643464 is a wasteful number, since it uses less digits than its factorization.

61643464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7705439 (or 7705435 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 61643464 is about 7851.3351730773. The cubic root of 61643464 is about 395.0290295388.

The spelling of 61643464 in words is "sixty-one million, six hundred forty-three thousand, four hundred sixty-four".