28130554 has 4 divisors (see below), whose sum is σ = 42195834. Its totient is φ = 14065276.

The previous prime is 28130549. The next prime is 28130579. The reversal of 28130554 is 45503182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45503182 = 2 ⋅22751591.

It can be written as a sum of positive squares in only one way, i.e., 15421329 + 12709225 = 3927^2 + 3565^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7032637 + ... + 7032640.

Almost surely, 2^28130554 is an apocalyptic number.

28130554 is a deficient number, since it is larger than the sum of its proper divisors (14065280).

28130554 is a wasteful number, since it uses less digits than its factorization.

28130554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14065279.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 28130554 is about 5303.8244691920. The cubic root of 28130554 is about 304.1301165648.

The spelling of 28130554 in words is "twenty-eight million, one hundred thirty thousand, five hundred fifty-four".