641402620 has 24 divisors (see below), whose sum is σ = 1378271664. Its totient is φ = 250594176.

The previous prime is 641402603. The next prime is 641402651. The reversal of 641402620 is 26204146.

It is a super-2 number, since 2×641402620² = 822794641885728800, 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 7 ways as a sum of consecutive naturals, for example, 372049 + ... + 373768.

It is an arithmetic number, because the mean of its divisors is an integer number (57427986).

Almost surely, 2^641402620 is an apocalyptic number.

It is an amenable number.

641402620 is an abundant number, since it is smaller than the sum of its proper divisors (736869044).

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

641402620 is a wasteful number, since it uses less digits than its factorization.

641402620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745869 (or 745867 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 641402620 is about 25325.9278211085. The cubic root of 641402620 is about 862.4029694108.

Adding to 641402620 its reverse (26204146), we get a palindrome (667606766).

The spelling of 641402620 in words is "six hundred forty-one million, four hundred two thousand, six hundred twenty".