2787447157 has 4 divisors (see below), whose sum is σ = 3040851456. Its totient is φ = 2534042860.

The previous prime is 2787447127. The next prime is 2787447161. The reversal of 2787447157 is 7517447872.

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 a de Polignac number, because none of the positive numbers 2^k-2787447157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2787447127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126702133 + ... + 126702154.

It is an arithmetic number, because the mean of its divisors is an integer number (760212864).

Almost surely, 2^2787447157 is an apocalyptic number.

It is an amenable number.

2787447157 is a deficient number, since it is larger than the sum of its proper divisors (253404299).

2787447157 is a wasteful number, since it uses less digits than its factorization.

2787447157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253404298.

The product of its digits is 3073280, while the sum is 52.

The square root of 2787447157 is about 52796.2797647713. The cubic root of 2787447157 is about 1407.3503139456.

It can be divided in two parts, 2787 and 447157, that added together give a palindrome (449944).

The spelling of 2787447157 in words is "two billion, seven hundred eighty-seven million, four hundred forty-seven thousand, one hundred fifty-seven".