2728393961 has 4 divisors (see below), whose sum is σ = 2730855300. Its totient is φ = 2725932624.

The previous prime is 2728393951. The next prime is 2728394047. The reversal of 2728393961 is 1693938272.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 740928400 + 1987465561 = 27220^2 + 44581^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728393961 - 2²⁶ = 2661285097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2728393931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1229006 + ... + 1231223.

It is an arithmetic number, because the mean of its divisors is an integer number (682713825).

Almost surely, 2^2728393961 is an apocalyptic number.

It is an amenable number.

2728393961 is a deficient number, since it is larger than the sum of its proper divisors (2461339).

2728393961 is a wasteful number, since it uses less digits than its factorization.

2728393961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461338.

The product of its digits is 979776, while the sum is 50.

The square root of 2728393961 is about 52234.0306792421. The cubic root of 2728393961 is about 1397.3408642159.

The spelling of 2728393961 in words is "two billion, seven hundred twenty-eight million, three hundred ninety-three thousand, nine hundred sixty-one".