28680501 has 4 divisors (see below), whose sum is σ = 38240672. Its totient is φ = 19120332.

The previous prime is 28680497. The next prime is 28680541. The reversal of 28680501 is 10508682.

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 not a de Polignac number, because 28680501 - 2² = 28680497 is a prime.

It is a super-2 number, since 2×28680501² = 1645142275222002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4780081 + ... + 4780086.

It is an arithmetic number, because the mean of its divisors is an integer number (9560168).

Almost surely, 2^28680501 is an apocalyptic number.

It is an amenable number.

28680501 is a deficient number, since it is larger than the sum of its proper divisors (9560171).

28680501 is an equidigital number, since it uses as much as digits as its factorization.

28680501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560170.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 28680501 is about 5355.4179108637. The cubic root of 28680501 is about 306.0992351905.

The spelling of 28680501 in words is "twenty-eight million, six hundred eighty thousand, five hundred one".