28057730402 has 8 divisors (see below), whose sum is σ = 45324026076. Its totient is φ = 12949721712.

The previous prime is 28057730401. The next prime is 28057730417. The reversal of 28057730402 is 20403775082.

It can be written as a sum of positive squares in 2 ways, for example, as 27811899361 + 245831041 = 166769^2 + 15679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28057730402² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28057730401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539571713 + ... + 539571764.

Almost surely, 2^28057730402 is an apocalyptic number.

28057730402 is a deficient number, since it is larger than the sum of its proper divisors (17266295674).

28057730402 is a wasteful number, since it uses less digits than its factorization.

28057730402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079143492.

The product of its (nonzero) digits is 94080, while the sum is 38.

The spelling of 28057730402 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, four hundred two".