276881661 has 48 divisors (see below), whose sum is σ = 483724800. Its totient is φ = 149084064.

The previous prime is 276881641. The next prime is 276881707. The reversal of 276881661 is 166188672.

It is a happy number.

It is not a de Polignac number, because 276881661 - 2⁵ = 276881629 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (276881641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 271210 + ... + 272228.

It is an arithmetic number, because the mean of its divisors is an integer number (10077600).

Almost surely, 2^276881661 is an apocalyptic number.

276881661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

276881661 is a deficient number, since it is larger than the sum of its proper divisors (206843139).

276881661 is a wasteful number, since it uses less digits than its factorization.

276881661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278 (or 1275 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 276881661 is about 16639.7614466073. The cubic root of 276881661 is about 651.7755486274.

The spelling of 276881661 in words is "two hundred seventy-six million, eight hundred eighty-one thousand, six hundred sixty-one".