641432052 has 18 divisors (see below), whose sum is σ = 1621397778. Its totient is φ = 213810672.

The previous prime is 641432021. The next prime is 641432069. The reversal of 641432052 is 250234146.

It can be written as a sum of positive squares in only one way, i.e., 620308836 + 21123216 = 24906^2 + 4596^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×641432052² = 822870154665861408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8908743 + ... + 8908814.

Almost surely, 2^641432052 is an apocalyptic number.

It is an amenable number.

641432052 is an abundant number, since it is smaller than the sum of its proper divisors (979965726).

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

641432052 is a wasteful number, since it uses less digits than its factorization.

641432052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17817567 (or 17817562 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 641432052 is about 25326.5088790382. The cubic root of 641432052 is about 862.4161602186.

Adding to 641432052 its reverse (250234146), we get a palindrome (891666198).

The spelling of 641432052 in words is "six hundred forty-one million, four hundred thirty-two thousand, fifty-two".