2788731949 has 4 divisors (see below), whose sum is σ = 2788889436. Its totient is φ = 2788574464.

The previous prime is 2788731947. The next prime is 2788731961. The reversal of 2788731949 is 9491378872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2368768900 + 419963049 = 48670^2 + 20493^2 .

It is a cyclic number.

It is not a de Polignac number, because 2788731949 - 2¹ = 2788731947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2788731893 and 2788731902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2788731941) 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, 48244 + ... + 88909.

It is an arithmetic number, because the mean of its divisors is an integer number (697222359).

Almost surely, 2^2788731949 is an apocalyptic number.

It is an amenable number.

2788731949 is a deficient number, since it is larger than the sum of its proper divisors (157487).

2788731949 is a wasteful number, since it uses less digits than its factorization.

2788731949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157486.

The product of its digits is 6096384, while the sum is 58.

The square root of 2788731949 is about 52808.4458112526. The cubic root of 2788731949 is about 1407.5665063478.

The spelling of 2788731949 in words is "two billion, seven hundred eighty-eight million, seven hundred thirty-one thousand, nine hundred forty-nine".