275638645 has 4 divisors (see below), whose sum is σ = 330766380. Its totient is φ = 220510912.

The previous prime is 275638633. The next prime is 275638667. The reversal of 275638645 is 546836572.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55383364 + 220255281 = 7442^2 + 14841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-275638645 is a prime.

It is a super-5 number, since 5×275638645⁵ (a number of 43 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 275638595 and 275638604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27563860 + ... + 27563869.

It is an arithmetic number, because the mean of its divisors is an integer number (82691595).

Almost surely, 2^275638645 is an apocalyptic number.

It is an amenable number.

275638645 is a deficient number, since it is larger than the sum of its proper divisors (55127735).

275638645 is an equidigital number, since it uses as much as digits as its factorization.

275638645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55127734.

The product of its digits is 1209600, while the sum is 46.

The square root of 275638645 is about 16602.3686563093. The cubic root of 275638645 is about 650.7987380077.

The spelling of 275638645 in words is "two hundred seventy-five million, six hundred thirty-eight thousand, six hundred forty-five".