28057731146 has 16 divisors (see below), whose sum is σ = 44278322760. Its totient is φ = 13316785920.

The previous prime is 28057731133. The next prime is 28057731173. The reversal of 28057731146 is 64113775082.

It can be written as a sum of positive squares in 4 ways, for example, as 13655091025 + 14402640121 = 116855^2 + 120011^2 .

It is a super-2 number, since 2×28057731146² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28057731097 and 28057731106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4620851 + ... + 4626918.

Almost surely, 2^28057731146 is an apocalyptic number.

28057731146 is a deficient number, since it is larger than the sum of its proper divisors (16220591614).

28057731146 is a wasteful number, since it uses less digits than its factorization.

28057731146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9247849.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 28057731146 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty-one thousand, one hundred forty-six".