28481617 has 8 divisors (see below), whose sum is σ = 29189160. Its totient is φ = 27780480.

The previous prime is 28481603. The next prime is 28481639. The reversal of 28481617 is 71618482.

It can be written as a sum of positive squares in 4 ways, for example, as 982081 + 27499536 = 991^2 + 5244^2 .

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

It is not a de Polignac number, because 28481617 - 2⁷ = 28481489 is a prime.

It is a super-2 number, since 2×28481617² = 1622405013869378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28481657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8109 + ... + 11077.

It is an arithmetic number, because the mean of its divisors is an integer number (3648645).

Almost surely, 2^28481617 is an apocalyptic number.

It is an amenable number.

28481617 is a deficient number, since it is larger than the sum of its proper divisors (707543).

28481617 is a wasteful number, since it uses less digits than its factorization.

28481617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203.

The product of its digits is 21504, while the sum is 37.

The square root of 28481617 is about 5336.8171225928. The cubic root of 28481617 is about 305.3900483192.

It can be divided in two parts, 2848 and 1617, that added together give a triangular number (4465 = T₉₄).

The spelling of 28481617 in words is "twenty-eight million, four hundred eighty-one thousand, six hundred seventeen".