66402544 has 80 divisors (see below), whose sum is σ = 149052960. Its totient is φ = 28385280.

The previous prime is 66402533. The next prime is 66402559. The reversal of 66402544 is 44520466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314599 + ... + 314809.

It is an arithmetic number, because the mean of its divisors is an integer number (1863162).

Almost surely, 2^66402544 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 66402544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74526480).

66402544 is an abundant number, since it is smaller than the sum of its proper divisors (82650416).

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

66402544 is a wasteful number, since it uses less digits than its factorization.

66402544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 66402544 is about 8148.7756135508. The cubic root of 66402544 is about 404.9439418422.

The spelling of 66402544 in words is "sixty-six million, four hundred two thousand, five hundred forty-four".