641401044 has 24 divisors (see below), whose sum is σ = 1507373280. Its totient is φ = 212261664.

The previous prime is 641401043. The next prime is 641401051. The reversal of 641401044 is 440104146.

It is a super-2 number, since 2×641401044² = 822790598488579872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641401043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190599 + ... + 193934.

It is an arithmetic number, because the mean of its divisors is an integer number (62807220).

Almost surely, 2^641401044 is an apocalyptic number.

It is an amenable number.

641401044 is an abundant number, since it is smaller than the sum of its proper divisors (865972236).

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

641401044 is a wasteful number, since it uses less digits than its factorization.

641401044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384679 (or 384677 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 641401044 is about 25325.8967067308. The cubic root of 641401044 is about 862.4022630691.

The spelling of 641401044 in words is "six hundred forty-one million, four hundred one thousand, forty-four".