66907404 has 48 divisors (see below), whose sum is σ = 174515040. Its totient is φ = 22167360.

The previous prime is 66907369. The next prime is 66907409. The reversal of 66907404 is 40470966.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66907409) 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, 16894 + ... + 20474.

It is an arithmetic number, because the mean of its divisors is an integer number (3635730).

Almost surely, 2^66907404 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 66907404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87257520).

66907404 is an abundant number, since it is smaller than the sum of its proper divisors (107607636).

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

66907404 is a wasteful number, since it uses less digits than its factorization.

66907404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767 (or 3759 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 66907404 is about 8179.6946153264. The cubic root of 66907404 is about 405.9676177591.

The spelling of 66907404 in words is "sixty-six million, nine hundred seven thousand, four hundred four".