276305640 has 128 divisors (see below), whose sum is σ = 916997760. Its totient is φ = 66161664.

The previous prime is 276305629. The next prime is 276305651. The reversal of 276305640 is 46503672.

It is an interprime number because it is at equal distance from previous prime (276305629) and next prime (276305651).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55327 + ... + 60113.

It is an arithmetic number, because the mean of its divisors is an integer number (7164045).

Almost surely, 2^276305640 is an apocalyptic number.

276305640 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 276305640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (458498880).

276305640 is an abundant number, since it is smaller than the sum of its proper divisors (640692120).

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

276305640 is a wasteful number, since it uses less digits than its factorization.

276305640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851 (or 4847 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 276305640 is about 16622.4438636441. The cubic root of 276305640 is about 651.3232530459.

The spelling of 276305640 in words is "two hundred seventy-six million, three hundred five thousand, six hundred forty".