275201820 has 48 divisors (see below), whose sum is σ = 856185120. Its totient is φ = 73387008.

The previous prime is 275201813. The next prime is 275201821. The reversal of 275201820 is 28102572.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275201821) 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, 254277 + ... + 255356.

It is an arithmetic number, because the mean of its divisors is an integer number (17837190).

Almost surely, 2^275201820 is an apocalyptic number.

275201820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

275201820 is an abundant number, since it is smaller than the sum of its proper divisors (580983300).

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

275201820 is a wasteful number, since it uses less digits than its factorization.

275201820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509651 (or 509643 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 275201820 is about 16589.2079376925. The cubic root of 275201820 is about 650.4547665651.

The spelling of 275201820 in words is "two hundred seventy-five million, two hundred one thousand, eight hundred twenty".