42720938279 has 4 divisors (see below), whose sum is σ = 42722093784. Its totient is φ = 42719782776.

The previous prime is 42720938269. The next prime is 42720938291. The reversal of 42720938279 is 97283902724.

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

It is a cyclic number.

It is not a de Polignac number, because 42720938279 - 2⁴ = 42720938263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42720938279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42720938209) 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, 520397 + ... + 596870.

It is an arithmetic number, because the mean of its divisors is an integer number (10680523446).

Almost surely, 2^42720938279 is an apocalyptic number.

42720938279 is a deficient number, since it is larger than the sum of its proper divisors (1155505).

42720938279 is a wasteful number, since it uses less digits than its factorization.

42720938279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155504.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 42720938279 in words is "forty-two billion, seven hundred twenty million, nine hundred thirty-eight thousand, two hundred seventy-nine".