2781990825 has 12 divisors (see below), whose sum is σ = 4599558288. Its totient is φ = 1483728400.

The previous prime is 2781990821. The next prime is 2781990839. The reversal of 2781990825 is 5280991872.

It is not a de Polignac number, because 2781990825 - 2² = 2781990821 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2781990821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18546531 + ... + 18546680.

It is an arithmetic number, because the mean of its divisors is an integer number (383296524).

Almost surely, 2^2781990825 is an apocalyptic number.

2781990825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2781990825 is a deficient number, since it is larger than the sum of its proper divisors (1817567463).

2781990825 is a wasteful number, since it uses less digits than its factorization.

2781990825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37093224 (or 37093219 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 2781990825 is about 52744.5810012744. The cubic root of 2781990825 is about 1406.4314341706.

The spelling of 2781990825 in words is "two billion, seven hundred eighty-one million, nine hundred ninety thousand, eight hundred twenty-five".