66613240 has 32 divisors (see below), whose sum is σ = 157770000. Its totient is φ = 25242624.

The previous prime is 66613229. The next prime is 66613247. The reversal of 66613240 is 4231666.

It is a junction number, because it is equal to n+sod(n) for n = 66613199 and 66613208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613247) 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, 43065 + ... + 44584.

Almost surely, 2^66613240 is an apocalyptic number.

It is an amenable number.

66613240 is an abundant number, since it is smaller than the sum of its proper divisors (91156760).

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

66613240 is a wasteful number, since it uses less digits than its factorization.

66613240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87679 (or 87675 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66613240 is about 8161.6934517292. The cubic root of 66613240 is about 405.3717868306.

The spelling of 66613240 in words is "sixty-six million, six hundred thirteen thousand, two hundred forty".