2729670781 has 2 divisors, whose sum is σ = 2729670782. Its totient is φ = 2729670780.

The previous prime is 2729670767. The next prime is 2729670793. The reversal of 2729670781 is 1870769272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2669375556 + 60295225 = 51666^2 + 7765^2 .

It is a cyclic number.

It is not a de Polignac number, because 2729670781 - 2²⁵ = 2696116349 is a prime.

It is a super-2 number, since 2×2729670781² = 14902205145290299922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2729673781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364835390 + 1364835391.

It is an arithmetic number, because the mean of its divisors is an integer number (1364835391).

Almost surely, 2^2729670781 is an apocalyptic number.

It is an amenable number.

2729670781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2729670781 is an equidigital number, since it uses as much as digits as its factorization.

2729670781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 2729670781 is about 52246.2513583511. The cubic root of 2729670781 is about 1397.5588037251.

The spelling of 2729670781 in words is "two billion, seven hundred twenty-nine million, six hundred seventy thousand, seven hundred eighty-one".