28463531 has 4 divisors (see below), whose sum is σ = 28671432. Its totient is φ = 28255632.

The previous prime is 28463507. The next prime is 28463551. The reversal of 28463531 is 13536482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28463531 - 2⁶ = 28463467 is a prime.

It is a super-2 number, since 2×28463531² = 1620345193975922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28463551) 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 3 ways as a sum of consecutive naturals, for example, 103745 + ... + 104018.

It is an arithmetic number, because the mean of its divisors is an integer number (7167858).

Almost surely, 2^28463531 is an apocalyptic number.

28463531 is a deficient number, since it is larger than the sum of its proper divisors (207901).

28463531 is a wasteful number, since it uses less digits than its factorization.

28463531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207900.

The product of its digits is 17280, while the sum is 32.

The square root of 28463531 is about 5335.1223978462. The cubic root of 28463531 is about 305.3253931191.

The spelling of 28463531 in words is "twenty-eight million, four hundred sixty-three thousand, five hundred thirty-one".