66904030 has 32 divisors (see below), whose sum is σ = 123669504. Its totient is φ = 26047776.

The previous prime is 66904003. The next prime is 66904031. The reversal of 66904030 is 3040966.

It is a super-2 number, since 2×66904030² = 8952298460481800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66904030.

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 15 ways as a sum of consecutive naturals, for example, 132759 + ... + 133261.

It is an arithmetic number, because the mean of its divisors is an integer number (3864672).

Almost surely, 2^66904030 is an apocalyptic number.

66904030 is a deficient number, since it is larger than the sum of its proper divisors (56765474).

66904030 is a wasteful number, since it uses less digits than its factorization.

66904030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 66904030 is about 8179.4883703078. The cubic root of 66904030 is about 405.9607936127.

Adding to 66904030 its reverse (3040966), we get a palindrome (69944996).

The spelling of 66904030 in words is "sixty-six million, nine hundred four thousand, thirty".