276621381 has 6 divisors (see below), whose sum is σ = 399564230. Its totient is φ = 184414248.

The previous prime is 276621349. The next prime is 276621407. The reversal of 276621381 is 183126672.

276621381 is a `hidden beast` number, since 27 + 6 + 621 + 3 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 190688481 + 85932900 = 13809^2 + 9270^2 .

It is not a de Polignac number, because 276621381 - 2⁵ = 276621349 is a prime.

It is a super-2 number, since 2×276621381² = 153038776852694322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (276621281) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 15367846 + ... + 15367863.

Almost surely, 2^276621381 is an apocalyptic number.

It is an amenable number.

276621381 is a deficient number, since it is larger than the sum of its proper divisors (122942849).

276621381 is a wasteful number, since it uses less digits than its factorization.

276621381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30735715 (or 30735712 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 276621381 is about 16631.9385821377. The cubic root of 276621381 is about 651.5712527748.

The spelling of 276621381 in words is "two hundred seventy-six million, six hundred twenty-one thousand, three hundred eighty-one".