664737009228 has 72 divisors (see below), whose sum is σ = 1683673992000. Its totient is φ = 221135443200.

The previous prime is 664737009227. The next prime is 664737009241. The reversal of 664737009228 is 822900737466.

664737009228 is a `hidden beast` number, since 6 + 6 + 47 + 370 + 0 + 9 + 228 = 666.

664737009228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×664737009228³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (664737009227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50440176 + ... + 50453352.

It is an arithmetic number, because the mean of its divisors is an integer number (23384361000).

Almost surely, 2^664737009228 is an apocalyptic number.

It is an amenable number.

664737009228 is an abundant number, since it is smaller than the sum of its proper divisors (1018936982772).

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

664737009228 is a wasteful number, since it uses less digits than its factorization.

664737009228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15887 (or 15882 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 664737009228 in words is "six hundred sixty-four billion, seven hundred thirty-seven million, nine thousand, two hundred twenty-eight".