66673544 has 64 divisors (see below), whose sum is σ = 148780800. Its totient is φ = 27417600.

The previous prime is 66673511. The next prime is 66673547. The reversal of 66673544 is 44537666.

It is a super-2 number, since 2×66673544² = 8890722939039872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (66673547) 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, 162812 + ... + 163220.

It is an arithmetic number, because the mean of its divisors is an integer number (2324700).

Almost surely, 2^66673544 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 66673544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74390400).

66673544 is an abundant number, since it is smaller than the sum of its proper divisors (82107256).

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

66673544 is a wasteful number, since it uses less digits than its factorization.

66673544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 530 counting only the distinct ones).

The product of its digits is 362880, while the sum is 41.

The square root of 66673544 is about 8165.3869473528. The cubic root of 66673544 is about 405.4940756690.

The spelling of 66673544 in words is "sixty-six million, six hundred seventy-three thousand, five hundred forty-four".