641091402 has 96 divisors (see below), whose sum is σ = 1680451200. Its totient is φ = 180605376.

The previous prime is 641091401. The next prime is 641091433. The reversal of 641091402 is 204190146.

641091402 is a `hidden beast` number, since 641 + 0 + 9 + 14 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (641091401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191499 + ... + 194817.

It is an arithmetic number, because the mean of its divisors is an integer number (17504700).

Almost surely, 2^641091402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641091402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840225600).

641091402 is an abundant number, since it is smaller than the sum of its proper divisors (1039359798).

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

641091402 is a wasteful number, since it uses less digits than its factorization.

641091402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417 (or 3404 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 641091402 is about 25319.7828189738. The cubic root of 641091402 is about 862.2634633032.

The spelling of 641091402 in words is "six hundred forty-one million, ninety-one thousand, four hundred two".