66533240 has 32 divisors (see below), whose sum is σ = 158507280. Its totient is φ = 25047552.

The previous prime is 66533239. The next prime is 66533261. The reversal of 66533240 is 4233566.

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, 48242 + ... + 49601.

Almost surely, 2^66533240 is an apocalyptic number.

It is an amenable number.

66533240 is an abundant number, since it is smaller than the sum of its proper divisors (91974040).

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

66533240 is a wasteful number, since it uses less digits than its factorization.

66533240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97871 (or 97867 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 66533240 is about 8156.7910356953. The cubic root of 66533240 is about 405.2094430588.

The spelling of 66533240 in words is "sixty-six million, five hundred thirty-three thousand, two hundred forty".