66213528 has 16 divisors (see below), whose sum is σ = 165533880. Its totient is φ = 22071168.

The previous prime is 66213523. The next prime is 66213529. The reversal of 66213528 is 82531266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66213523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1379425 + ... + 1379472.

Almost surely, 2^66213528 is an apocalyptic number.

It is an amenable number.

66213528 is an abundant number, since it is smaller than the sum of its proper divisors (99320352).

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

66213528 is a wasteful number, since it uses less digits than its factorization.

66213528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758906 (or 2758902 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 66213528 is about 8137.1695324603. The cubic root of 66213528 is about 404.5593500302.

The spelling of 66213528 in words is "sixty-six million, two hundred thirteen thousand, five hundred twenty-eight".