275440640 has 88 divisors (see below), whose sum is σ = 689757120. Its totient is φ = 105340928.

The previous prime is 275440631. The next prime is 275440651. The reversal of 275440640 is 46044572.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 275440597 and 275440606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116591 + ... + 118929.

Almost surely, 2^275440640 is an apocalyptic number.

275440640 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 275440640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344878560).

275440640 is an abundant number, since it is smaller than the sum of its proper divisors (414316480).

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

275440640 is a wasteful number, since it uses less digits than its factorization.

275440640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387 (or 2369 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 275440640 is about 16596.4044298758. The cubic root of 275440640 is about 650.6428669368.

The spelling of 275440640 in words is "two hundred seventy-five million, four hundred forty thousand, six hundred forty".