641339690 has 16 divisors (see below), whose sum is σ = 1159456680. Its totient is φ = 255414720.

The previous prime is 641339689. The next prime is 641339693. The reversal of 641339690 is 96933146.

641339690 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 633881329 + 7458361 = 25177^2 + 2731^2 .

It is a super-2 number, since 2×641339690² = 822633195938592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641339693) 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, 137741 + ... + 142320.

Almost surely, 2^641339690 is an apocalyptic number.

641339690 is a deficient number, since it is larger than the sum of its proper divisors (518116990).

641339690 is a wasteful number, since it uses less digits than its factorization.

641339690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280297.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 641339690 is about 25324.6853879767. The cubic root of 641339690 is about 862.3747641452.

The spelling of 641339690 in words is "six hundred forty-one million, three hundred thirty-nine thousand, six hundred ninety".