66535744 has 56 divisors (see below), whose sum is σ = 149047200. Its totient is φ = 29191680.

The previous prime is 66535687. The next prime is 66535769. The reversal of 66535744 is 44753566.

It is a junction number, because it is equal to n+sod(n) for n = 66535697 and 66535706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18787 + ... + 22045.

Almost surely, 2^66535744 is an apocalyptic number.

66535744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66535744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74523600).

66535744 is an abundant number, since it is smaller than the sum of its proper divisors (82511456).

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

66535744 is a wasteful number, since it uses less digits than its factorization.

66535744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311 (or 3301 counting only the distinct ones).

The product of its digits is 302400, while the sum is 40.

The square root of 66535744 is about 8156.9445259852. The cubic root of 66535744 is about 405.2145263911.

The spelling of 66535744 in words is "sixty-six million, five hundred thirty-five thousand, seven hundred forty-four".