641909152 has 24 divisors (see below), whose sum is σ = 1297916676. Its totient is φ = 312279552.

The previous prime is 641909143. The next prime is 641909153. The reversal of 641909152 is 251909146.

It can be written as a sum of positive squares in 2 ways, for example, as 629207056 + 12702096 = 25084^2 + 3564^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (641909153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269893 + ... + 272260.

Almost surely, 2^641909152 is an apocalyptic number.

It is an amenable number.

641909152 is an abundant number, since it is smaller than the sum of its proper divisors (656007524).

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

641909152 is a wasteful number, since it uses less digits than its factorization.

641909152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542200 (or 542192 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 641909152 is about 25335.9261129330. The cubic root of 641909152 is about 862.6299302123.

The spelling of 641909152 in words is "six hundred forty-one million, nine hundred nine thousand, one hundred fifty-two".