275475640 has 64 divisors (see below), whose sum is σ = 699516000. Its totient is φ = 96714240.

The previous prime is 275475631. The next prime is 275475643. The reversal of 275475640 is 46574572.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 275475593 and 275475602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275475643) 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, 1966 + ... + 23554.

Almost surely, 2^275475640 is an apocalyptic number.

275475640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 275475640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349758000).

275475640 is an abundant number, since it is smaller than the sum of its proper divisors (424040360).

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

275475640 is a wasteful number, since it uses less digits than its factorization.

275475640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21640 (or 21636 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 40.

The square root of 275475640 is about 16597.4588416420. The cubic root of 275475640 is about 650.6704246420.

The spelling of 275475640 in words is "two hundred seventy-five million, four hundred seventy-five thousand, six hundred forty".