55729664 has 40 divisors (see below), whose sum is σ = 112693680. Its totient is φ = 27529216.

The previous prime is 55729651. The next prime is 55729673. The reversal of 55729664 is 46692755.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44957 + ... + 46179.

It is an arithmetic number, because the mean of its divisors is an integer number (2817342).

Almost surely, 2^55729664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55729664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56346840).

55729664 is an abundant number, since it is smaller than the sum of its proper divisors (56964016).

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

55729664 is an equidigital number, since it uses as much as digits as its factorization.

55729664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 1314 counting only the distinct ones).

The product of its digits is 453600, while the sum is 44.

The square root of 55729664 is about 7465.2303380405. The cubic root of 55729664 is about 381.9696073332.

The spelling of 55729664 in words is "fifty-five million, seven hundred twenty-nine thousand, six hundred sixty-four".