28270660 has 48 divisors (see below), whose sum is σ = 68584320. Its totient is φ = 9674240.

The previous prime is 28270639. The next prime is 28270661. The reversal of 28270660 is 6607282.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28270661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (1428840).

Almost surely, 2^28270660 is an apocalyptic number.

28270660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28270660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34292160).

28270660 is an abundant number, since it is smaller than the sum of its proper divisors (40313660).

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

28270660 is a wasteful number, since it uses less digits than its factorization.

28270660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7596 (or 7594 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 28270660 is about 5317.0160804722. The cubic root of 28270660 is about 304.6341937075.

The spelling of 28270660 in words is "twenty-eight million, two hundred seventy thousand, six hundred sixty".