646287228 has 48 divisors (see below), whose sum is σ = 1690419360. Its totient is φ = 213518592.

The previous prime is 646287221. The next prime is 646287233. The reversal of 646287228 is 822782646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646287221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14275 + ... + 38682.

It is an arithmetic number, because the mean of its divisors is an integer number (35217070).

Almost surely, 2^646287228 is an apocalyptic number.

It is an amenable number.

646287228 is an abundant number, since it is smaller than the sum of its proper divisors (1044132132).

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

646287228 is a wasteful number, since it uses less digits than its factorization.

646287228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53083 (or 53075 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 646287228 is about 25422.1798435933. The cubic root of 646287228 is about 864.5866482630.

The spelling of 646287228 in words is "six hundred forty-six million, two hundred eighty-seven thousand, two hundred twenty-eight".