28102557 has 8 divisors (see below), whose sum is σ = 42822976. Its totient is φ = 16058592.

The previous prime is 28102553. The next prime is 28102559. The reversal of 28102557 is 75520182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28102557 - 2² = 28102553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669088 + ... + 669129.

It is an arithmetic number, because the mean of its divisors is an integer number (5352872).

Almost surely, 2^28102557 is an apocalyptic number.

It is an amenable number.

28102557 is a deficient number, since it is larger than the sum of its proper divisors (14720419).

28102557 is a wasteful number, since it uses less digits than its factorization.

28102557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338227.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 28102557 is about 5301.1844902814. The cubic root of 28102557 is about 304.0291876696.

The spelling of 28102557 in words is "twenty-eight million, one hundred two thousand, five hundred fifty-seven".