66428534 has 8 divisors (see below), whose sum is σ = 99691680. Its totient is φ = 33197976.

The previous prime is 66428491. The next prime is 66428539. The reversal of 66428534 is 43582466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66428539) 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, 2174 + ... + 11729.

It is an arithmetic number, because the mean of its divisors is an integer number (12461460).

Almost surely, 2^66428534 is an apocalyptic number.

66428534 is a deficient number, since it is larger than the sum of its proper divisors (33263146).

66428534 is a wasteful number, since it uses less digits than its factorization.

66428534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16294.

The product of its digits is 138240, while the sum is 38.

The square root of 66428534 is about 8150.3701756423. The cubic root of 66428534 is about 404.9967667272.

The spelling of 66428534 in words is "sixty-six million, four hundred twenty-eight thousand, five hundred thirty-four".