2782155725 has 12 divisors (see below), whose sum is σ = 3469819956. Its totient is φ = 2212855680.

The previous prime is 2782155707. The next prime is 2782155749. The reversal of 2782155725 is 5275512872.

It can be written as a sum of positive squares in 6 ways, for example, as 38700841 + 2743454884 = 6221^2 + 52378^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2782155725 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 317312 + ... + 325961.

It is an arithmetic number, because the mean of its divisors is an integer number (289151663).

Almost surely, 2^2782155725 is an apocalyptic number.

2782155725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2782155725 is a deficient number, since it is larger than the sum of its proper divisors (687664231).

2782155725 is a wasteful number, since it uses less digits than its factorization.

2782155725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643456 (or 643451 counting only the distinct ones).

The product of its digits is 392000, while the sum is 44.

The square root of 2782155725 is about 52746.1441718729. The cubic root of 2782155725 is about 1406.4592219404.

The spelling of 2782155725 in words is "two billion, seven hundred eighty-two million, one hundred fifty-five thousand, seven hundred twenty-five".