28745660 has 12 divisors (see below), whose sum is σ = 60365928. Its totient is φ = 11498256.

The previous prime is 28745627. The next prime is 28745669. The reversal of 28745660 is 6654782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28745669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718622 + ... + 718661.

It is an arithmetic number, because the mean of its divisors is an integer number (5030494).

Almost surely, 2^28745660 is an apocalyptic number.

28745660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28745660 is an abundant number, since it is smaller than the sum of its proper divisors (31620268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28745660 is a wasteful number, since it uses less digits than its factorization.

28745660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437292 (or 1437290 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 28745660 is about 5361.4979250206. The cubic root of 28745660 is about 306.3308679959.

The spelling of 28745660 in words is "twenty-eight million, seven hundred forty-five thousand, six hundred sixty".