28651537 has 4 divisors (see below), whose sum is σ = 29897280. Its totient is φ = 27405796.

The previous prime is 28651531. The next prime is 28651541. The reversal of 28651537 is 73515682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28651537 - 2¹⁹ = 28127249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28651496 and 28651505.

It is not an unprimeable number, because it can be changed into a prime (28651531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622837 + ... + 622882.

It is an arithmetic number, because the mean of its divisors is an integer number (7474320).

Almost surely, 2^28651537 is an apocalyptic number.

It is an amenable number.

28651537 is a deficient number, since it is larger than the sum of its proper divisors (1245743).

28651537 is a wasteful number, since it uses less digits than its factorization.

28651537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245742.

The product of its digits is 50400, while the sum is 37.

The square root of 28651537 is about 5352.7130504072. The cubic root of 28651537 is about 305.9961588365.

The spelling of 28651537 in words is "twenty-eight million, six hundred fifty-one thousand, five hundred thirty-seven".