28073537 has 16 divisors (see below), whose sum is σ = 29970000. Its totient is φ = 26256384.

The previous prime is 28073533. The next prime is 28073567. The reversal of 28073537 is 73537082.

It can be written as a sum of positive squares in 8 ways, for example, as 3083536 + 24990001 = 1756^2 + 4999^2 .

It is a cyclic number.

It is not a de Polignac number, because 28073537 - 2² = 28073533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28073497 and 28073506.

It is not an unprimeable number, because it can be changed into a prime (28073533) 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, 188339 + ... + 188487.

It is an arithmetic number, because the mean of its divisors is an integer number (1873125).

Almost surely, 2^28073537 is an apocalyptic number.

It is an amenable number.

28073537 is a deficient number, since it is larger than the sum of its proper divisors (1896463).

28073537 is a wasteful number, since it uses less digits than its factorization.

28073537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 28073537 is about 5298.4466591634. The cubic root of 28073537 is about 303.9245000931.

The spelling of 28073537 in words is "twenty-eight million, seventy-three thousand, five hundred thirty-seven".