28912770 has 96 divisors (see below), whose sum is σ = 79732224. Its totient is φ = 7257600.

The previous prime is 28912729. The next prime is 28912781. The reversal of 28912770 is 7721982.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 119850 + ... + 120090.

It is an arithmetic number, because the mean of its divisors is an integer number (830544).

Almost surely, 2^28912770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28912770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39866112).

28912770 is an abundant number, since it is smaller than the sum of its proper divisors (50819454).

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

28912770 is a wasteful number, since it uses less digits than its factorization.

28912770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28912770 is about 5377.0596053977. The cubic root of 28912770 is about 306.9233292889.

The spelling of 28912770 in words is "twenty-eight million, nine hundred twelve thousand, seven hundred seventy".