275628981 has 8 divisors (see below), whose sum is σ = 369083520. Its totient is φ = 182963552.

The previous prime is 275628979. The next prime is 275629027. The reversal of 275628981 is 189826572.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 275628981 - 2¹ = 275628979 is a prime.

It is a super-2 number, since 2×275628981² = 151942670334196722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 275628981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275628911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196461 + ... + 197858.

It is an arithmetic number, because the mean of its divisors is an integer number (46135440).

Almost surely, 2^275628981 is an apocalyptic number.

It is an amenable number.

275628981 is a deficient number, since it is larger than the sum of its proper divisors (93454539).

275628981 is a wasteful number, since it uses less digits than its factorization.

275628981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394555.

The product of its digits is 483840, while the sum is 48.

The square root of 275628981 is about 16602.0776109498. The cubic root of 275628981 is about 650.7911321650.

The spelling of 275628981 in words is "two hundred seventy-five million, six hundred twenty-eight thousand, nine hundred eighty-one".