273640821 has 32 divisors (see below), whose sum is σ = 388577280. Its totient is φ = 170938944.

The previous prime is 273640819. The next prime is 273640859. The reversal of 273640821 is 128046372.

It is not a de Polignac number, because 273640821 - 2¹ = 273640819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (273640811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 987735 + ... + 988011.

It is an arithmetic number, because the mean of its divisors is an integer number (12143040).

Almost surely, 2^273640821 is an apocalyptic number.

It is an amenable number.

273640821 is a deficient number, since it is larger than the sum of its proper divisors (114936459).

273640821 is a wasteful number, since it uses less digits than its factorization.

273640821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 273640821 is about 16542.0924009026. The cubic root of 273640821 is about 649.2225980117. Note that the first 3 decimals are identical.

The spelling of 273640821 in words is "two hundred seventy-three million, six hundred forty thousand, eight hundred twenty-one".