2742758721 has 6 divisors (see below), whose sum is σ = 3961762610. Its totient is φ = 1828505808.

The previous prime is 2742758633. The next prime is 2742758729. The reversal of 2742758721 is 1278572472.

2742758721 is a `hidden beast` number, since 2 + 7 + 42 + 7 + 587 + 21 = 666.

2742758721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2135826225 + 606932496 = 46215^2 + 24636^2 .

It is not a de Polignac number, because 2742758721 - 2⁷ = 2742758593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2742758729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 152375476 + ... + 152375493.

Almost surely, 2^2742758721 is an apocalyptic number.

It is an amenable number.

2742758721 is a deficient number, since it is larger than the sum of its proper divisors (1219003889).

2742758721 is a wasteful number, since it uses less digits than its factorization.

2742758721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304750975 (or 304750972 counting only the distinct ones).

The product of its digits is 439040, while the sum is 45.

The square root of 2742758721 is about 52371.3540115205. The cubic root of 2742758721 is about 1399.7888662898.

The spelling of 2742758721 in words is "two billion, seven hundred forty-two million, seven hundred fifty-eight thousand, seven hundred twenty-one".