2872643257 has 4 divisors (see below), whose sum is σ = 3133792656. Its totient is φ = 2611493860.

The previous prime is 2872643239. The next prime is 2872643281. The reversal of 2872643257 is 7523462782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2872643257 - 2²³ = 2864254649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2872643297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130574683 + ... + 130574704.

It is an arithmetic number, because the mean of its divisors is an integer number (783448164).

Almost surely, 2^2872643257 is an apocalyptic number.

It is an amenable number.

2872643257 is a deficient number, since it is larger than the sum of its proper divisors (261149399).

2872643257 is a wasteful number, since it uses less digits than its factorization.

2872643257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261149398.

The product of its digits is 1128960, while the sum is 46.

The square root of 2872643257 is about 53597.0452263928. The cubic root of 2872643257 is about 1421.5448466912.

It can be divided in two parts, 287264 and 3257, that added together give a square (290521 = 539²).

The spelling of 2872643257 in words is "two billion, eight hundred seventy-two million, six hundred forty-three thousand, two hundred fifty-seven".