28102957 has 8 divisors (see below), whose sum is σ = 30536960. Its totient is φ = 25764480.

The previous prime is 28102933. The next prime is 28102967. The reversal of 28102957 is 75920182.

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

It is a cyclic number.

It is not a de Polignac number, because 28102957 - 2¹⁹ = 27578669 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 (28102967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23268 + ... + 24445.

It is an arithmetic number, because the mean of its divisors is an integer number (3817120).

Almost surely, 2^28102957 is an apocalyptic number.

It is an amenable number.

28102957 is a deficient number, since it is larger than the sum of its proper divisors (2434003).

28102957 is a wasteful number, since it uses less digits than its factorization.

28102957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47763.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28102957 is about 5301.2222175645. Note that the first 4 decimals coincide. The cubic root of 28102957 is about 304.0306301374.

Subtracting 28102957 from its reverse (75920182), we obtain a square (47817225 = 6915²).

The spelling of 28102957 in words is "twenty-eight million, one hundred two thousand, nine hundred fifty-seven".