28505970 has 96 divisors (see below), whose sum is σ = 79252992. Its totient is φ = 7092096.

The previous prime is 28505969. The next prime is 28506011. The reversal of 28505970 is 7950582.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97144 + ... + 97436.

It is an arithmetic number, because the mean of its divisors is an integer number (825552).

Almost surely, 2^28505970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28505970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39626496).

28505970 is an abundant number, since it is smaller than the sum of its proper divisors (50747022).

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

28505970 is a wasteful number, since it uses less digits than its factorization.

28505970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 28505970 is about 5339.0982384669. The cubic root of 28505970 is about 305.4770640383.

The spelling of 28505970 in words is "twenty-eight million, five hundred five thousand, nine hundred seventy".