28680545 has 8 divisors (see below), whose sum is σ = 34450920. Its totient is φ = 22921600.

The previous prime is 28680541. The next prime is 28680551. The reversal of 28680545 is 54508682.

It can be written as a sum of positive squares in 4 ways, for example, as 2588881 + 26091664 = 1609^2 + 5108^2 .

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

It is not a de Polignac number, because 28680545 - 2² = 28680541 is a prime.

It is a super-2 number, since 2×28680545² = 1645147322994050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28680499 and 28680508.

It is not an unprimeable number, because it can be changed into a prime (28680541) 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, 4301 + ... + 8709.

It is an arithmetic number, because the mean of its divisors is an integer number (4306365).

Almost surely, 2^28680545 is an apocalyptic number.

It is an amenable number.

28680545 is a deficient number, since it is larger than the sum of its proper divisors (5770375).

28680545 is a wasteful number, since it uses less digits than its factorization.

28680545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715.

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 28680545 is about 5355.4220188515. The cubic root of 28680545 is about 306.0993917238.

The spelling of 28680545 in words is "twenty-eight million, six hundred eighty thousand, five hundred forty-five".