640075461 has 16 divisors (see below), whose sum is σ = 868492416. Its totient is φ = 419233536.

The previous prime is 640075453. The next prime is 640075489. The reversal of 640075461 is 164570046.

It is not a de Polignac number, because 640075461 - 2³ = 640075453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640075421) 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, 52041 + ... + 63153.

It is an arithmetic number, because the mean of its divisors is an integer number (54280776).

Almost surely, 2^640075461 is an apocalyptic number.

It is an amenable number.

640075461 is a deficient number, since it is larger than the sum of its proper divisors (228416955).

640075461 is a wasteful number, since it uses less digits than its factorization.

640075461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11452.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 640075461 is about 25299.7126663526. The cubic root of 640075461 is about 861.8077446392.

The spelling of 640075461 in words is "six hundred forty million, seventy-five thousand, four hundred sixty-one".