66838480 has 40 divisors (see below), whose sum is σ = 160418304. Its totient is φ = 25872000.

The previous prime is 66838439. The next prime is 66838481. The reversal of 66838480 is 8483866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66838481) 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, 10996 + ... + 15955.

Almost surely, 2^66838480 is an apocalyptic number.

It is an amenable number.

66838480 is an abundant number, since it is smaller than the sum of its proper divisors (93579824).

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

66838480 is a wasteful number, since it uses less digits than its factorization.

66838480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26995 (or 26989 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 66838480 is about 8175.4804140185. The cubic root of 66838480 is about 405.8281686897.

The spelling of 66838480 in words is "sixty-six million, eight hundred thirty-eight thousand, four hundred eighty".