28001501 has 16 divisors (see below), whose sum is σ = 32140800. Its totient is φ = 24158400.

The previous prime is 28001473. The next prime is 28001509. The reversal of 28001501 is 10510082.

It is a cyclic number.

It is not a de Polignac number, because 28001501 - 2¹⁰ = 28000477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28001501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28001509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18740 + ... + 20178.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 2^28001501 is an apocalyptic number.

It is an amenable number.

28001501 is a deficient number, since it is larger than the sum of its proper divisors (4139299).

28001501 is a wasteful number, since it uses less digits than its factorization.

28001501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 28001501 is about 5291.6444513969. The cubic root of 28001501 is about 303.6643231859.

Adding to 28001501 its reverse (10510082), we get a palindrome (38511583).

The spelling of 28001501 in words is "twenty-eight million, one thousand, five hundred one".