63840228 has 24 divisors (see below), whose sum is σ = 156801120. Its totient is φ = 20160000.

The previous prime is 63840199. The next prime is 63840229. The reversal of 63840228 is 82204836.

It is a super-2 number, since 2×63840228² = 8151149422183968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63840229) 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, 139773 + ... + 140228.

It is an arithmetic number, because the mean of its divisors is an integer number (6533380).

Almost surely, 2^63840228 is an apocalyptic number.

It is an amenable number.

63840228 is an abundant number, since it is smaller than the sum of its proper divisors (92960892).

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

63840228 is a wasteful number, since it uses less digits than its factorization.

63840228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280027 (or 280025 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 63840228 is about 7990.0080100085. The cubic root of 63840228 is about 399.6668642952. Note that the first 3 decimals are identical.

The spelling of 63840228 in words is "sixty-three million, eight hundred forty thousand, two hundred twenty-eight".