641335464 has 192 divisors, whose sum is σ = 2240784000. Its totient is φ = 160796160.

The previous prime is 641335459. The next prime is 641335469. The reversal of 641335464 is 464533146.

641335464 is a `hidden beast` number, since 64 + 133 + 5 + 464 = 666.

It is an interprime number because it is at equal distance from previous prime (641335459) and next prime (641335469).

It is a super-2 number, since 2×641335464² = 822622354768190592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (641335469) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158782 + ... + 162770.

It is an arithmetic number, because the mean of its divisors is an integer number (11670750).

Almost surely, 2^641335464 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 641335464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120392000).

641335464 is an abundant number, since it is smaller than the sum of its proper divisors (1599448536).

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

641335464 is a wasteful number, since it uses less digits than its factorization.

641335464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048 (or 4041 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 641335464 is about 25324.6019514621. The cubic root of 641335464 is about 862.3728699832.

The spelling of 641335464 in words is "six hundred forty-one million, three hundred thirty-five thousand, four hundred sixty-four".