28650538 has 16 divisors (see below), whose sum is σ = 49189824. Its totient is φ = 12260160.

The previous prime is 28650533. The next prime is 28650551. The reversal of 28650538 is 83505682.

It is a junction number, because it is equal to n+sod(n) for n = 28650497 and 28650506.

It is not an unprimeable number, because it can be changed into a prime (28650533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12178 + ... + 14338.

It is an arithmetic number, because the mean of its divisors is an integer number (3074364).

Almost surely, 2^28650538 is an apocalyptic number.

28650538 is a deficient number, since it is larger than the sum of its proper divisors (20539286).

28650538 is a wasteful number, since it uses less digits than its factorization.

28650538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 28650538 is about 5352.6197324301. The cubic root of 28650538 is about 305.9926023814.

The spelling of 28650538 in words is "twenty-eight million, six hundred fifty thousand, five hundred thirty-eight".