28715670 has 48 divisors (see below), whose sum is σ = 75190752. Its totient is φ = 7603200.

The previous prime is 28715653. The next prime is 28715677. The reversal of 28715670 is 7651782.

28715670 is a `hidden beast` number, since 28 + 71 + 567 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715677) 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 23 ways as a sum of consecutive naturals, for example, 12534 + ... + 14646.

It is an arithmetic number, because the mean of its divisors is an integer number (1566474).

Almost surely, 2^28715670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28715670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37595376).

28715670 is an abundant number, since it is smaller than the sum of its proper divisors (46475082).

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

28715670 is a wasteful number, since it uses less digits than its factorization.

28715670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2274 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 28715670 is about 5358.7004021498. The cubic root of 28715670 is about 306.2243004951.

The spelling of 28715670 in words is "twenty-eight million, seven hundred fifteen thousand, six hundred seventy".