2666720287 has 24 divisors (see below), whose sum is σ = 3427004160. Its totient is φ = 2051627760.

The previous prime is 2666720269. The next prime is 2666720299. The reversal of 2666720287 is 7820276662.

It is not a de Polignac number, because 2666720287 - 2⁷ = 2666720159 is a prime.

It is a super-2 number, since 2×2666720287² = 14222794178194724738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666720227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11268 + ... + 73894.

It is an arithmetic number, because the mean of its divisors is an integer number (142791840).

Almost surely, 2^2666720287 is an apocalyptic number.

2666720287 is a deficient number, since it is larger than the sum of its proper divisors (760283873).

2666720287 is a wasteful number, since it uses less digits than its factorization.

2666720287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62731 (or 62724 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 46.

The square root of 2666720287 is about 51640.2971234674. The cubic root of 2666720287 is about 1386.7318432046.

The spelling of 2666720287 in words is "two billion, six hundred sixty-six million, seven hundred twenty thousand, two hundred eighty-seven".