66394480 has 40 divisors (see below), whose sum is σ = 154713312. Its totient is φ = 26498304.

The previous prime is 66394429. The next prime is 66394483. The reversal of 66394480 is 8449366.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66394483) 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, 58882 + ... + 59998.

Almost surely, 2^66394480 is an apocalyptic number.

It is an amenable number.

66394480 is an abundant number, since it is smaller than the sum of its proper divisors (88318832).

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

66394480 is a wasteful number, since it uses less digits than its factorization.

66394480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 66394480 is about 8148.2808002670. The cubic root of 66394480 is about 404.9275488953.

The spelling of 66394480 in words is "sixty-six million, three hundred ninety-four thousand, four hundred eighty".