28057728074 has 8 divisors (see below), whose sum is σ = 42089608260. Its totient is φ = 14027858656.

The previous prime is 28057728073. The next prime is 28057728109. The reversal of 28057728074 is 47082775082.

It can be written as a sum of positive squares in 2 ways, for example, as 23502423025 + 4555305049 = 153305^2 + 67493^2 .

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

It is a super-2 number, since 2×28057728074² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28057728073) 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, 467309 + ... + 523920.

Almost surely, 2^28057728074 is an apocalyptic number.

28057728074 is a deficient number, since it is larger than the sum of its proper divisors (14031880186).

28057728074 is a wasteful number, since it uses less digits than its factorization.

28057728074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005384.

The product of its (nonzero) digits is 1756160, while the sum is 50.

The spelling of 28057728074 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, seventy-four".