55664532 has 144 divisors (see below), whose sum is σ = 179891712. Its totient is φ = 14091840.

The previous prime is 55664527. The next prime is 55664533. The reversal of 55664532 is 23546655.

It is a happy number.

55664532 is a `hidden beast` number, since 5 + 5 + 6 + 645 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55664533) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118963 + ... + 119429.

It is an arithmetic number, because the mean of its divisors is an integer number (1249248).

Almost surely, 2^55664532 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 55664532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89945856).

55664532 is an abundant number, since it is smaller than the sum of its proper divisors (124227180).

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

55664532 is a wasteful number, since it uses less digits than its factorization.

55664532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538 (or 533 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 55664532 is about 7460.8667056851. The cubic root of 55664532 is about 381.8207450044.

The spelling of 55664532 in words is "fifty-five million, six hundred sixty-four thousand, five hundred thirty-two".