276640 has 96 divisors (see below), whose sum is σ = 846720. Its totient is φ = 82944.

The previous prime is 276637. The next prime is 276671. The reversal of 276640 is 46672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14551 + ... + 14569.

It is an arithmetic number, because the mean of its divisors is an integer number (8820).

2²⁷⁶⁶⁴⁰ is an apocalyptic number.

276640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

276640 is the 304-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 276640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423360).

276640 is an abundant number, since it is smaller than the sum of its proper divisors (570080).

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

276640 is a wasteful number, since it uses less digits than its factorization.

276640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 276640 is about 525.9657783544. The cubic root of 276640 is about 65.1585871231.

The spelling of 276640 in words is "two hundred seventy-six thousand, six hundred forty".