641513280 has 56 divisors (see below), whose sum is σ = 2036807712. Its totient is φ = 171069952.

The previous prime is 641513251. The next prime is 641513281. The reversal of 641513280 is 82315146.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641513281) 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, 333162 + ... + 335081.

Almost surely, 2^641513280 is an apocalyptic number.

641513280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641513280 is an abundant number, since it is smaller than the sum of its proper divisors (1395294432).

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

641513280 is a wasteful number, since it uses less digits than its factorization.

641513280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668263 (or 668253 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 641513280 is about 25328.1124444756. The cubic root of 641513280 is about 862.4525628185.

The spelling of 641513280 in words is "six hundred forty-one million, five hundred thirteen thousand, two hundred eighty".