2687029281 has 20 divisors (see below), whose sum is σ = 4122447252. Its totient is φ = 1742935968.

The previous prime is 2687029277. The next prime is 2687029283. The reversal of 2687029281 is 1829207862.

It can be written as a sum of positive squares in 2 ways, for example, as 936360000 + 1750669281 = 30600^2 + 41841^2 .

It is not a de Polignac number, because 2687029281 - 2² = 2687029277 is a prime.

It is a super-2 number, since 2×2687029281² = 14440252713902753922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2687029283) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 445290 + ... + 451283.

Almost surely, 2^2687029281 is an apocalyptic number.

It is an amenable number.

2687029281 is a deficient number, since it is larger than the sum of its proper divisors (1435417971).

2687029281 is an equidigital number, since it uses as much as digits as its factorization.

2687029281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896622 (or 896613 counting only the distinct ones).

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

The square root of 2687029281 is about 51836.5631673243. The cubic root of 2687029281 is about 1390.2432645334.

The spelling of 2687029281 in words is "two billion, six hundred eighty-seven million, twenty-nine thousand, two hundred eighty-one".