276643381 has 8 divisors (see below), whose sum is σ = 323516864. Its totient is φ = 231608160.

The previous prime is 276643373. The next prime is 276643391. The reversal of 276643381 is 183346672.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 276643381 - 2³ = 276643373 is a prime.

It is a super-2 number, since 2×276643381² = 153063120502222322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (276643331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459240 + ... + 459841.

It is an arithmetic number, because the mean of its divisors is an integer number (40439608).

Almost surely, 2^276643381 is an apocalyptic number.

It is an amenable number.

276643381 is a deficient number, since it is larger than the sum of its proper divisors (46873483).

276643381 is an equidigital number, since it uses as much as digits as its factorization.

276643381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919131.

The product of its digits is 145152, while the sum is 40.

The square root of 276643381 is about 16632.5999470919. The cubic root of 276643381 is about 651.5885257076.

The spelling of 276643381 in words is "two hundred seventy-six million, six hundred forty-three thousand, three hundred eighty-one".