66502240 has 48 divisors (see below), whose sum is σ = 179559072. Its totient is φ = 22800384.

The previous prime is 66502231. The next prime is 66502243. The reversal of 66502240 is 4220566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66502243) 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, 28569 + ... + 30808.

It is an arithmetic number, because the mean of its divisors is an integer number (3740814).

Almost surely, 2^66502240 is an apocalyptic number.

It is an amenable number.

66502240 is an abundant number, since it is smaller than the sum of its proper divisors (113056832).

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

66502240 is a wasteful number, since it uses less digits than its factorization.

66502240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59399 (or 59391 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 66502240 is about 8154.8905572055. The cubic root of 66502240 is about 405.1464998634.

The spelling of 66502240 in words is "sixty-six million, five hundred two thousand, two hundred forty".