2781521412 has 48 divisors (see below), whose sum is σ = 6550129152. Its totient is φ = 918641920.

The previous prime is 2781521377. The next prime is 2781521417. The reversal of 2781521412 is 2141251872.

It is a super-2 number, since 2×2781521412² = 15473722730828947488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2781521417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1072237 + ... + 1074827.

It is an arithmetic number, because the mean of its divisors is an integer number (136461024).

Almost surely, 2^2781521412 is an apocalyptic number.

It is an amenable number.

2781521412 is an abundant number, since it is smaller than the sum of its proper divisors (3768607740).

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

2781521412 is a wasteful number, since it uses less digits than its factorization.

2781521412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388 (or 3386 counting only the distinct ones).

The product of its digits is 8960, while the sum is 33.

The square root of 2781521412 is about 52740.1309440923. The cubic root of 2781521412 is about 1406.3523260336.

The spelling of 2781521412 in words is "two billion, seven hundred eighty-one million, five hundred twenty-one thousand, four hundred twelve".