640055541 has 24 divisors (see below), whose sum is σ = 887271840. Its totient is φ = 410295712.

The previous prime is 640055497. The next prime is 640055587. The reversal of 640055541 is 145550046.

It is not a de Polignac number, because 640055541 - 2²⁹ = 103184629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640055499 and 640055508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640051541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 390175 + ... + 391811.

It is an arithmetic number, because the mean of its divisors is an integer number (36969660).

Almost surely, 2^640055541 is an apocalyptic number.

It is an amenable number.

640055541 is a deficient number, since it is larger than the sum of its proper divisors (247216299).

640055541 is a wasteful number, since it uses less digits than its factorization.

640055541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793 (or 1746 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 640055541 is about 25299.3189829292. The cubic root of 640055541 is about 861.7988043452.

The spelling of 640055541 in words is "six hundred forty million, fifty-five thousand, five hundred forty-one".