28820008 has 16 divisors (see below), whose sum is σ = 61757280. Its totient is φ = 12351408.

The previous prime is 28819991. The next prime is 28820009. The reversal of 28820008 is 80002882.

It is a super-2 number, since 2×28820008² = 1661185722240128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (28820009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257266 + ... + 257377.

It is an arithmetic number, because the mean of its divisors is an integer number (3859830).

Almost surely, 2^28820008 is an apocalyptic number.

28820008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28820008 is an abundant number, since it is smaller than the sum of its proper divisors (32937272).

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

28820008 is a wasteful number, since it uses less digits than its factorization.

28820008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514656 (or 514652 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 28820008 is about 5368.4269576851. The cubic root of 28820008 is about 306.5947394849.

The spelling of 28820008 in words is "twenty-eight million, eight hundred twenty thousand, eight".