42780113 has 4 divisors (see below), whose sum is σ = 42795108. Its totient is φ = 42765120.

The previous prime is 42780091. The next prime is 42780119. The reversal of 42780113 is 31108724.

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 4129024 + 38651089 = 2032^2 + 6217^2 .

It is a cyclic number.

It is not a de Polignac number, because 42780113 - 2⁸ = 42779857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42780119) 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, 1748 + ... + 9413.

It is an arithmetic number, because the mean of its divisors is an integer number (10698777).

Almost surely, 2^42780113 is an apocalyptic number.

It is an amenable number.

42780113 is a deficient number, since it is larger than the sum of its proper divisors (14995).

42780113 is a wasteful number, since it uses less digits than its factorization.

42780113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14994.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 42780113 is about 6540.6508085970. The cubic root of 42780113 is about 349.7416133753.

Adding to 42780113 its reverse (31108724), we get a palindrome (73888837).

The spelling of 42780113 in words is "forty-two million, seven hundred eighty thousand, one hundred thirteen".