641209284 has 60 divisors (see below), whose sum is σ = 1689554944. Its totient is φ = 212039856.

The previous prime is 641209277. The next prime is 641209337. The reversal of 641209284 is 482902146.

641209284 is a `hidden beast` number, since 641 + 2 + 0 + 9 + 2 + 8 + 4 = 666.

It is a super-3 number, since 3×641209284³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33357 + ... + 48939.

Almost surely, 2^641209284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641209284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844777472).

641209284 is an abundant number, since it is smaller than the sum of its proper divisors (1048345660).

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

641209284 is a wasteful number, since it uses less digits than its factorization.

641209284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15726 (or 15715 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 641209284 is about 25322.1105755425. The cubic root of 641209284 is about 862.3163102201.

The spelling of 641209284 in words is "six hundred forty-one million, two hundred nine thousand, two hundred eighty-four".