66904040 has 32 divisors (see below), whose sum is σ = 172039680. Its totient is φ = 22938432.

The previous prime is 66904031. The next prime is 66904049. The reversal of 66904040 is 4040966.

It is an interprime number because it is at equal distance from previous prime (66904031) and next prime (66904049).

It is a junction number, because it is equal to n+sod(n) for n = 66903994 and 66904012.

It is not an unprimeable number, because it can be changed into a prime (66904049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119192 + ... + 119751.

It is an arithmetic number, because the mean of its divisors is an integer number (5376240).

Almost surely, 2^66904040 is an apocalyptic number.

It is an amenable number.

66904040 is an abundant number, since it is smaller than the sum of its proper divisors (105135640).

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

66904040 is a wasteful number, since it uses less digits than its factorization.

66904040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238961 (or 238957 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 66904040 is about 8179.4889815929. The cubic root of 66904040 is about 405.9608138387.

The spelling of 66904040 in words is "sixty-six million, nine hundred four thousand, forty".