2785128825 has 24 divisors (see below), whose sum is σ = 4763534400. Its totient is φ = 1434180160.

The previous prime is 2785128817. The next prime is 2785128839. The reversal of 2785128825 is 5288215872.

It is not a de Polignac number, because 2785128825 - 2³ = 2785128817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 638085 + ... + 642434.

It is an arithmetic number, because the mean of its divisors is an integer number (198480600).

Almost surely, 2^2785128825 is an apocalyptic number.

2785128825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2785128825 is a deficient number, since it is larger than the sum of its proper divisors (1978405575).

2785128825 is a wasteful number, since it uses less digits than its factorization.

2785128825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280561 (or 1280556 counting only the distinct ones).

The product of its digits is 716800, while the sum is 48.

The square root of 2785128825 is about 52774.3197492872. The cubic root of 2785128825 is about 1406.9600392561.

The spelling of 2785128825 in words is "two billion, seven hundred eighty-five million, one hundred twenty-eight thousand, eight hundred twenty-five".