66603628 has 48 divisors (see below), whose sum is σ = 145648384. Its totient is φ = 25945920.

The previous prime is 66603623. The next prime is 66603629. The reversal of 66603628 is 82630666.

It is not an unprimeable number, because it can be changed into a prime (66603623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23023 + ... + 25753.

Almost surely, 2^66603628 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 66603628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72824192).

66603628 is an abundant number, since it is smaller than the sum of its proper divisors (79044756).

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

66603628 is a wasteful number, since it uses less digits than its factorization.

66603628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822 (or 2820 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 66603628 is about 8161.1045821016. The cubic root of 66603628 is about 405.3522880992.

The spelling of 66603628 in words is "sixty-six million, six hundred three thousand, six hundred twenty-eight".