2787840061 has 2 divisors, whose sum is σ = 2787840062. Its totient is φ = 2787840060.

The previous prime is 2787840023. The next prime is 2787840071. The reversal of 2787840061 is 1600487872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1670275161 + 1117564900 = 40869^2 + 33430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787840061 - 2⁷ = 2787839933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2787840001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393920030 + 1393920031.

It is an arithmetic number, because the mean of its divisors is an integer number (1393920031).

Almost surely, 2^2787840061 is an apocalyptic number.

It is an amenable number.

2787840061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2787840061 is an equidigital number, since it uses as much as digits as its factorization.

2787840061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 2787840061 is about 52800.0005776515. Note that the first 3 decimals coincide. The cubic root of 2787840061 is about 1407.4164350902.

The spelling of 2787840061 in words is "two billion, seven hundred eighty-seven million, eight hundred forty thousand, sixty-one".