2787218725 has 12 divisors (see below), whose sum is σ = 3490373700. Its totient is φ = 2207696000.

The previous prime is 2787218719. The next prime is 2787218747. The reversal of 2787218725 is 5278127872.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 11404129 + 2775814596 = 3377^2 + 52686^2 .

It is not a de Polignac number, because 2787218725 - 2¹³ = 2787210533 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549400 + ... + 554449.

It is an arithmetic number, because the mean of its divisors is an integer number (290864475).

Almost surely, 2^2787218725 is an apocalyptic number.

2787218725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2787218725 is a deficient number, since it is larger than the sum of its proper divisors (703154975).

2787218725 is a wasteful number, since it uses less digits than its factorization.

2787218725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103960 (or 1103955 counting only the distinct ones).

The product of its digits is 878080, while the sum is 49.

The square root of 2787218725 is about 52794.1163862035. The cubic root of 2787218725 is about 1407.3118686573.

The spelling of 2787218725 in words is "two billion, seven hundred eighty-seven million, two hundred eighteen thousand, seven hundred twenty-five".