66450428 has 24 divisors (see below), whose sum is σ = 127540224. Its totient is φ = 30042800.

The previous prime is 66450421. The next prime is 66450481. The reversal of 66450428 is 82405466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66450421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4451 + ... + 12357.

It is an arithmetic number, because the mean of its divisors is an integer number (5314176).

Almost surely, 2^66450428 is an apocalyptic number.

It is an amenable number.

66450428 is a deficient number, since it is larger than the sum of its proper divisors (61089796).

66450428 is a wasteful number, since it uses less digits than its factorization.

66450428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8113 (or 8111 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 66450428 is about 8151.7131941697. The cubic root of 66450428 is about 405.0412557678.

The spelling of 66450428 in words is "sixty-six million, four hundred fifty thousand, four hundred twenty-eight".