275556820 has 48 divisors (see below), whose sum is σ = 721461888. Its totient is φ = 85887360.

The previous prime is 275556793. The next prime is 275556839. The reversal of 275556820 is 28655572.

It is a super-2 number, since 2×275556820² = 151863122097024800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87927 + ... + 91006.

It is an arithmetic number, because the mean of its divisors is an integer number (15030456).

Almost surely, 2^275556820 is an apocalyptic number.

275556820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

275556820 is an abundant number, since it is smaller than the sum of its proper divisors (445905068).

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

275556820 is a wasteful number, since it uses less digits than its factorization.

275556820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178960 (or 178958 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 275556820 is about 16599.9042165911. The cubic root of 275556820 is about 650.7343337863.

The spelling of 275556820 in words is "two hundred seventy-five million, five hundred fifty-six thousand, eight hundred twenty".