66532928 has 112 divisors (see below), whose sum is σ = 172053504. Its totient is φ = 24752640.

The previous prime is 66532891. The next prime is 66532933. The reversal of 66532928 is 82923566.

It is a tau number, because it is divible by the number of its divisors (112).

Its product of digits (155520) is a multiple of the sum of its prime factors (640).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113051 + ... + 113637.

It is an arithmetic number, because the mean of its divisors is an integer number (1536192).

Almost surely, 2^66532928 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 66532928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86026752).

66532928 is an abundant number, since it is smaller than the sum of its proper divisors (105520576).

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

66532928 is a wasteful number, since it uses less digits than its factorization.

66532928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 630 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 66532928 is about 8156.7719105048. The cubic root of 66532928 is about 405.2088096634.

The spelling of 66532928 in words is "sixty-six million, five hundred thirty-two thousand, nine hundred twenty-eight".