28520738 has 8 divisors (see below), whose sum is σ = 43322880. Its totient is φ = 14079780.

The previous prime is 28520711. The next prime is 28520773. The reversal of 28520738 is 83702582.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 28520698 and 28520707.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 90098 + ... + 90413.

It is an arithmetic number, because the mean of its divisors is an integer number (5415360).

Almost surely, 2^28520738 is an apocalyptic number.

28520738 is a deficient number, since it is larger than the sum of its proper divisors (14802142).

28520738 is a wasteful number, since it uses less digits than its factorization.

28520738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180592.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28520738 is about 5340.4810644735. The cubic root of 28520738 is about 305.5298074514.

The spelling of 28520738 in words is "twenty-eight million, five hundred twenty thousand, seven hundred thirty-eight".