61475664 has 20 divisors (see below), whose sum is σ = 158812256. Its totient is φ = 20491872.

The previous prime is 61475663. The next prime is 61475719. The reversal of 61475664 is 46657416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61475663) 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, 640324 + ... + 640419.

Almost surely, 2^61475664 is an apocalyptic number.

It is an amenable number.

61475664 is an abundant number, since it is smaller than the sum of its proper divisors (97336592).

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

61475664 is a wasteful number, since it uses less digits than its factorization.

61475664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280754 (or 1280748 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 61475664 is about 7840.6418104642. The cubic root of 61475664 is about 394.6702669402.

It can be divided in two parts, 6147 and 5664, that added together give a palindrome (11811).

The spelling of 61475664 in words is "sixty-one million, four hundred seventy-five thousand, six hundred sixty-four".