641433390 has 128 divisors (see below), whose sum is σ = 1703116800. Its totient is φ = 153653760.

The previous prime is 641433349. The next prime is 641433491. The reversal of 641433390 is 93334146.

It is a super-2 number, since 2×641433390² = 822873587613784200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3358195 + ... + 3358385.

It is an arithmetic number, because the mean of its divisors is an integer number (13305600).

Almost surely, 2^641433390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641433390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851558400).

641433390 is an abundant number, since it is smaller than the sum of its proper divisors (1061683410).

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

641433390 is a wasteful number, since it uses less digits than its factorization.

641433390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 641433390 is about 25326.5352940350. The cubic root of 641433390 is about 862.4167598726.

The spelling of 641433390 in words is "six hundred forty-one million, four hundred thirty-three thousand, three hundred ninety".