40724784257 has 4 divisors (see below), whose sum is σ = 40752813780. Its totient is φ = 40696754736.

The previous prime is 40724784253. The next prime is 40724784277. The reversal of 40724784257 is 75248742704.

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 31851897841 + 8872886416 = 178471^2 + 94196^2 .

It is a cyclic number.

It is not a de Polignac number, because 40724784257 - 2² = 40724784253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40724784251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14012582 + ... + 14015487.

It is an arithmetic number, because the mean of its divisors is an integer number (10188203445).

Almost surely, 2^40724784257 is an apocalyptic number.

It is an amenable number.

40724784257 is a deficient number, since it is larger than the sum of its proper divisors (28029523).

40724784257 is a wasteful number, since it uses less digits than its factorization.

40724784257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28029522.

The product of its (nonzero) digits is 3512320, while the sum is 50.

The spelling of 40724784257 in words is "forty billion, seven hundred twenty-four million, seven hundred eighty-four thousand, two hundred fifty-seven".