2781991090 has 16 divisors (see below), whose sum is σ = 5038308288. Its totient is φ = 1105968816.

The previous prime is 2781991087. The next prime is 2781991097. The reversal of 2781991090 is 901991872.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2781991090.

It is not an unprimeable number, because it can be changed into a prime (2781991097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851742 + ... + 855001.

It is an arithmetic number, because the mean of its divisors is an integer number (314894268).

Almost surely, 2^2781991090 is an apocalyptic number.

2781991090 is a deficient number, since it is larger than the sum of its proper divisors (2256317198).

2781991090 is a wasteful number, since it uses less digits than its factorization.

2781991090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706913.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 2781991090 is about 52744.5835133808. The cubic root of 2781991090 is about 1406.4314788274.

The spelling of 2781991090 in words is "two billion, seven hundred eighty-one million, nine hundred ninety-one thousand, ninety".