61646464 has 32 divisors (see below), whose sum is σ = 133979040. Its totient is φ = 28020480.

The previous prime is 61646449. The next prime is 61646467. The reversal of 61646464 is 46464616.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (61646467) 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 3 ways as a sum of consecutive naturals, for example, 20484 + ... + 23299.

It is an arithmetic number, because the mean of its divisors is an integer number (4186845).

Almost surely, 2^61646464 is an apocalyptic number.

61646464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61646464 is an abundant number, since it is smaller than the sum of its proper divisors (72332576).

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

61646464 is a wasteful number, since it uses less digits than its factorization.

61646464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43808 (or 43796 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

The square root of 61646464 is about 7851.5262210605. The cubic root of 61646464 is about 395.0354377221.

The spelling of 61646464 in words is "sixty-one million, six hundred forty-six thousand, four hundred sixty-four".