66481404 has 24 divisors (see below), whose sum is σ = 169225728. Its totient is φ = 20145840.

The previous prime is 66481381. The next prime is 66481409. The reversal of 66481404 is 40418466.

It is a super-2 number, since 2×66481404² = 8839554155622432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66481409) 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, 251692 + ... + 251955.

It is an arithmetic number, because the mean of its divisors is an integer number (7051072).

Almost surely, 2^66481404 is an apocalyptic number.

It is an amenable number.

66481404 is an abundant number, since it is smaller than the sum of its proper divisors (102744324).

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

66481404 is a wasteful number, since it uses less digits than its factorization.

66481404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503665 (or 503663 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 66481404 is about 8153.6129415125. The cubic root of 66481404 is about 405.1041829216.

The spelling of 66481404 in words is "sixty-six million, four hundred eighty-one thousand, four hundred four".