276666642 has 72 divisors (see below), whose sum is σ = 707029596. Its totient is φ = 77946624.

The previous prime is 276666631. The next prime is 276666667. The reversal of 276666642 is 246666672.

It can be written as a sum of positive squares in 2 ways, for example, as 275925321 + 741321 = 16611^2 + 861^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62238 + ... + 66534.

Almost surely, 2^276666642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 276666642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353514798).

276666642 is an abundant number, since it is smaller than the sum of its proper divisors (430362954).

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

276666642 is a wasteful number, since it uses less digits than its factorization.

276666642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4392 (or 4382 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 276666642 is about 16633.2991916817. The cubic root of 276666642 is about 651.6067876975.

The spelling of 276666642 in words is "two hundred seventy-six million, six hundred sixty-six thousand, six hundred forty-two".