2781881730 has 24 divisors (see below), whose sum is σ = 7232892732. Its totient is φ = 741835104.

The previous prime is 2781881699. The next prime is 2781881771. The reversal of 2781881730 is 371881872.

It can be written as a sum of positive squares in 2 ways, for example, as 2781191169 + 690561 = 52737^2 + 831^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15454809 + ... + 15454988.

Almost surely, 2^2781881730 is an apocalyptic number.

2781881730 is an abundant number, since it is smaller than the sum of its proper divisors (4451011002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2781881730 is a wasteful number, since it uses less digits than its factorization.

2781881730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30909810 (or 30909807 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 2781881730 is about 52743.5468090647. The cubic root of 2781881730 is about 1406.4130496572.

The spelling of 2781881730 in words is "two billion, seven hundred eighty-one million, eight hundred eighty-one thousand, seven hundred thirty".