28130357 has 4 divisors (see below), whose sum is σ = 29353440. Its totient is φ = 26907276.

The previous prime is 28130351. The next prime is 28130363. The reversal of 28130357 is 75303182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75303182 = 2 ⋅37651591.

It is an interprime number because it is at equal distance from previous prime (28130351) and next prime (28130363).

It is a cyclic number.

It is not a de Polignac number, because 28130357 - 2¹² = 28126261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130351) 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, 611507 + ... + 611552.

It is an arithmetic number, because the mean of its divisors is an integer number (7338360).

Almost surely, 2^28130357 is an apocalyptic number.

It is an amenable number.

28130357 is a deficient number, since it is larger than the sum of its proper divisors (1223083).

28130357 is a wasteful number, since it uses less digits than its factorization.

28130357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223082.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 28130357 is about 5303.8058976550. The cubic root of 28130357 is about 304.1294066158.

The spelling of 28130357 in words is "twenty-eight million, one hundred thirty thousand, three hundred fifty-seven".