28520737 has 8 divisors (see below), whose sum is σ = 32630400. Its totient is φ = 24419904.

The previous prime is 28520711. The next prime is 28520773. The reversal of 28520737 is 73702582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28520737 - 2²³ = 20132129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28550737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7689 + ... + 10777.

It is an arithmetic number, because the mean of its divisors is an integer number (4078800).

Almost surely, 2^28520737 is an apocalyptic number.

It is an amenable number.

28520737 is a deficient number, since it is larger than the sum of its proper divisors (4109663).

28520737 is a wasteful number, since it uses less digits than its factorization.

28520737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28520737 is about 5340.4809708490. The cubic root of 28520737 is about 305.5298038806.

The spelling of 28520737 in words is "twenty-eight million, five hundred twenty thousand, seven hundred thirty-seven".