28432906057 has 4 divisors (see below), whose sum is σ = 28448088340. Its totient is φ = 28417723776.

The previous prime is 28432906043. The next prime is 28432906081. The reversal of 28432906057 is 75060923482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75060923482 = 2 ⋅37530461741.

It can be written as a sum of positive squares in 2 ways, for example, as 5421229641 + 23011676416 = 73629^2 + 151696^2 .

It is a cyclic number.

It is not a de Polignac number, because 28432906057 - 2¹⁵ = 28432873289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28432905998 and 28432906016.

It is not an unprimeable number, because it can be changed into a prime (28432906097) 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, 7588332 + ... + 7592077.

It is an arithmetic number, because the mean of its divisors is an integer number (7112022085).

Almost surely, 2^28432906057 is an apocalyptic number.

It is an amenable number.

28432906057 is a deficient number, since it is larger than the sum of its proper divisors (15182283).

28432906057 is a wasteful number, since it uses less digits than its factorization.

28432906057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15182282.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 28432906057 in words is "twenty-eight billion, four hundred thirty-two million, nine hundred six thousand, fifty-seven".