66240140 has 24 divisors (see below), whose sum is σ = 139452432. Its totient is φ = 26429760.

The previous prime is 66240131. The next prime is 66240173. The reversal of 66240140 is 4104266.

It is a happy number.

It is a super-2 number, since 2×66240140² = 8775512294439200, which contains 22 as substring.

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, 4487 + ... + 12353.

It is an arithmetic number, because the mean of its divisors is an integer number (5810518).

Almost surely, 2^66240140 is an apocalyptic number.

It is an amenable number.

66240140 is an abundant number, since it is smaller than the sum of its proper divisors (73212292).

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

66240140 is a wasteful number, since it uses less digits than its factorization.

66240140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8297 (or 8295 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 66240140 is about 8138.8045805266. The cubic root of 66240140 is about 404.6135418332.

The spelling of 66240140 in words is "sixty-six million, two hundred forty thousand, one hundred forty".