28897704 has 144 divisors (see below), whose sum is σ = 89631360. Its totient is φ = 8395200.

The previous prime is 28897699. The next prime is 28897709. The reversal of 28897704 is 40779882.

28897704 = T₄₀₉ + T₄₁₀ + ... + T₆₂₂.

It is an interprime number because it is at equal distance from previous prime (28897699) and next prime (28897709).

It is a self number, because there is not a number n which added to its sum of digits gives 28897704.

It is not an unprimeable number, because it can be changed into a prime (28897709) 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 35 ways as a sum of consecutive naturals, for example, 270019 + ... + 270125.

It is an arithmetic number, because the mean of its divisors is an integer number (622440).

Almost surely, 2^28897704 is an apocalyptic number.

28897704 is a gapful number since it is divisible by the number (24) 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 28897704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44815680).

28897704 is an abundant number, since it is smaller than the sum of its proper divisors (60733656).

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

28897704 is a wasteful number, since it uses less digits than its factorization.

28897704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 28897704 is about 5375.6584712945. The cubic root of 28897704 is about 306.8700090167.

The spelling of 28897704 in words is "twenty-eight million, eight hundred ninety-seven thousand, seven hundred four".