28513408 has 96 divisors (see below), whose sum is σ = 71628480. Its totient is φ = 11066880.

The previous prime is 28513393. The next prime is 28513423. The reversal of 28513408 is 80431582.

It is an interprime number because it is at equal distance from previous prime (28513393) and next prime (28513423).

It is a self number, because there is not a number n which added to its sum of digits gives 28513408.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108285 + ... + 108547.

It is an arithmetic number, because the mean of its divisors is an integer number (746130).

Almost surely, 2^28513408 is an apocalyptic number.

28513408 is a gapful number since it is divisible by the number (28) 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 28513408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35814240).

28513408 is an abundant number, since it is smaller than the sum of its proper divisors (43115072).

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

28513408 is a wasteful number, since it uses less digits than its factorization.

28513408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28513408 is about 5339.7947526099. The cubic root of 28513408 is about 305.5036308804.

The spelling of 28513408 in words is "twenty-eight million, five hundred thirteen thousand, four hundred eight".