28500938 has 4 divisors (see below), whose sum is σ = 42751410. Its totient is φ = 14250468.

The previous prime is 28500919. The next prime is 28500991. The reversal of 28500938 is 83900582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83900582 = 2 ⋅41950291.

It can be written as a sum of positive squares in only one way, i.e., 24671089 + 3829849 = 4967^2 + 1957^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28500898 and 28500907.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7125233 + ... + 7125236.

Almost surely, 2^28500938 is an apocalyptic number.

28500938 is a deficient number, since it is larger than the sum of its proper divisors (14250472).

28500938 is a wasteful number, since it uses less digits than its factorization.

28500938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14250471.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 28500938 is about 5338.6269770419. The cubic root of 28500938 is about 305.4590882594.

The spelling of 28500938 in words is "twenty-eight million, five hundred thousand, nine hundred thirty-eight".