28513437 has 16 divisors (see below), whose sum is σ = 40368960. Its totient is φ = 17839872.

The previous prime is 28513423. The next prime is 28513439. The reversal of 28513437 is 73431582.

It is not a de Polignac number, because 28513437 - 2¹¹ = 28511389 is a prime.

It is a super-3 number, since 3×28513437³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28513398 and 28513407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28513439) 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 15 ways as a sum of consecutive naturals, for example, 26139 + ... + 27207.

It is an arithmetic number, because the mean of its divisors is an integer number (2523060).

Almost surely, 2^28513437 is an apocalyptic number.

It is an amenable number.

28513437 is a deficient number, since it is larger than the sum of its proper divisors (11855523).

28513437 is a wasteful number, since it uses less digits than its factorization.

28513437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612.

The product of its digits is 20160, while the sum is 33.

The square root of 28513437 is about 5339.7974680694. The cubic root of 28513437 is about 305.5037344527.

The spelling of 28513437 in words is "twenty-eight million, five hundred thirteen thousand, four hundred thirty-seven".