641230992 has 100 divisors (see below), whose sum is σ = 1879701120. Its totient is φ = 211004352.

The previous prime is 641230987. The next prime is 641231009. The reversal of 641230992 is 299032146.

641230992 is a `hidden beast` number, since 641 + 2 + 3 + 0 + 9 + 9 + 2 = 666.

It is a super-2 number, since 2×641230992² = 822354370202608128, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 99253 + ... + 105515.

Almost surely, 2^641230992 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 641230992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (939850560).

641230992 is an abundant number, since it is smaller than the sum of its proper divisors (1238470128).

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

641230992 is a wasteful number, since it uses less digits than its factorization.

641230992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6362 (or 6347 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 641230992 is about 25322.5392091709. The cubic root of 641230992 is about 862.3260412869.

The spelling of 641230992 in words is "six hundred forty-one million, two hundred thirty thousand, nine hundred ninety-two".