66904032 has 48 divisors (see below), whose sum is σ = 189136080. Its totient is φ = 20585472.

The previous prime is 66904031. The next prime is 66904049. The reversal of 66904032 is 23040966.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×66904032² = 8952298995714048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66904031) 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, 25557 + ... + 28052.

It is an arithmetic number, because the mean of its divisors is an integer number (3940335).

Almost surely, 2^66904032 is an apocalyptic number.

It is an amenable number.

66904032 is an abundant number, since it is smaller than the sum of its proper divisors (122232048).

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

66904032 is a wasteful number, since it uses less digits than its factorization.

66904032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53635 (or 53627 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 66904032 is about 8179.4884925648. The cubic root of 66904032 is about 405.9607976579.

Adding to 66904032 its reverse (23040966), we get a palindrome (89944998).

The spelling of 66904032 in words is "sixty-six million, nine hundred four thousand, thirty-two".