641564340 has 48 divisors (see below), whose sum is σ = 1813838208. Its totient is φ = 169421184.

The previous prime is 641564333. The next prime is 641564347. The reversal of 641564340 is 43465146.

It is an interprime number because it is at equal distance from previous prime (641564333) and next prime (641564347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641564347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45727 + ... + 58086.

It is an arithmetic number, because the mean of its divisors is an integer number (37788296).

Almost surely, 2^641564340 is an apocalyptic number.

641564340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641564340 is an abundant number, since it is smaller than the sum of its proper divisors (1172273868).

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

641564340 is a wasteful number, since it uses less digits than its factorization.

641564340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103928 (or 103926 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 641564340 is about 25329.1203953078. The cubic root of 641564340 is about 862.4754439554.

The spelling of 641564340 in words is "six hundred forty-one million, five hundred sixty-four thousand, three hundred forty".