28485621 has 16 divisors (see below), whose sum is σ = 43563520. Its totient is φ = 18377280.

The previous prime is 28485601. The next prime is 28485629. The reversal of 28485621 is 12658482.

28485621 is a `hidden beast` number, since 28 + 4 + 8 + 5 + 621 = 666.

It is not a de Polignac number, because 28485621 - 2¹⁰ = 28484597 is a prime.

It is a super-2 number, since 2×28485621² = 1622861207511282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28485629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16180 + ... + 17853.

It is an arithmetic number, because the mean of its divisors is an integer number (2722720).

Almost surely, 2^28485621 is an apocalyptic number.

It is an amenable number.

28485621 is a deficient number, since it is larger than the sum of its proper divisors (15077899).

28485621 is a wasteful number, since it uses less digits than its factorization.

28485621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34073 (or 34067 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28485621 is about 5337.1922393708. The cubic root of 28485621 is about 305.4043584203.

It can be divided in two parts, 284 and 85621, that added together give a triangular number (85905 = T₄₁₄).

The spelling of 28485621 in words is "twenty-eight million, four hundred eighty-five thousand, six hundred twenty-one".