641097816 has 64 divisors (see below), whose sum is σ = 1660888800. Its totient is φ = 206051328.

The previous prime is 641097811. The next prime is 641097817. The reversal of 641097816 is 618790146.

It is a super-2 number, since 2×641097816² = 822012819359939712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641097811) 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, 97150 + ... + 103538.

Almost surely, 2^641097816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641097816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830444400).

641097816 is an abundant number, since it is smaller than the sum of its proper divisors (1019790984).

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

641097816 is a wasteful number, since it uses less digits than its factorization.

641097816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6548 (or 6544 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 641097816 is about 25319.9094785112. The cubic root of 641097816 is about 862.2663388887.

The spelling of 641097816 in words is "six hundred forty-one million, ninety-seven thousand, eight hundred sixteen".