28524991 has 16 divisors (see below), whose sum is σ = 33527808. Its totient is φ = 23997600.

The previous prime is 28524989. The next prime is 28525019. The reversal of 28524991 is 19942582.

It is not a de Polignac number, because 28524991 - 2¹ = 28524989 is a prime.

It is a super-2 number, since 2×28524991² = 1627350223100162, 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 (28524931) 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, 6025 + ... + 9661.

It is an arithmetic number, because the mean of its divisors is an integer number (2095488).

Almost surely, 2^28524991 is an apocalyptic number.

28524991 is a deficient number, since it is larger than the sum of its proper divisors (5002817).

28524991 is a wasteful number, since it uses less digits than its factorization.

28524991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702.

The product of its digits is 51840, while the sum is 40.

The square root of 28524991 is about 5340.8792347328. The cubic root of 28524991 is about 305.5449935204.

The spelling of 28524991 in words is "twenty-eight million, five hundred twenty-four thousand, nine hundred ninety-one".