28490515 has 8 divisors (see below), whose sum is σ = 34368768. Its totient is φ = 22672320.

The previous prime is 28490509. The next prime is 28490533. The reversal of 28490515 is 51509482.

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

It is not a de Polignac number, because 28490515 - 2²¹ = 26393363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13962 + ... + 15871.

It is an arithmetic number, because the mean of its divisors is an integer number (4296096).

Almost surely, 2^28490515 is an apocalyptic number.

28490515 is a deficient number, since it is larger than the sum of its proper divisors (5878253).

28490515 is a wasteful number, since it uses less digits than its factorization.

28490515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30029.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 28490515 is about 5337.6507004487. The cubic root of 28490515 is about 305.4218475170.

Adding to 28490515 its reverse (51509482), we get a palindrome (79999997).

The spelling of 28490515 in words is "twenty-eight million, four hundred ninety thousand, five hundred fifteen".