28946970 has 80 divisors (see below), whose sum is σ = 83853000. Its totient is φ = 7122816.

The previous prime is 28946941. The next prime is 28946977. The reversal of 28946970 is 7964982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11881809 + 17065161 = 3447^2 + 4131^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28946977) 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 39 ways as a sum of consecutive naturals, for example, 9156 + ... + 11904.

Almost surely, 2^28946970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28946970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41926500).

28946970 is an abundant number, since it is smaller than the sum of its proper divisors (54906030).

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

28946970 is a wasteful number, since it uses less digits than its factorization.

28946970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781 (or 2772 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 28946970 is about 5380.2388422820. The cubic root of 28946970 is about 307.0442982334.

The spelling of 28946970 in words is "twenty-eight million, nine hundred forty-six thousand, nine hundred seventy".