28963240 has 64 divisors (see below), whose sum is σ = 69672960. Its totient is φ = 10798080.

The previous prime is 28963237. The next prime is 28963241. The reversal of 28963240 is 4236982.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 28963196 and 28963205.

It is not an unprimeable number, because it can be changed into a prime (28963241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129769 + ... + 129991.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^28963240 is an apocalyptic number.

28963240 is a gapful number since it is divisible by the number (20) 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 28963240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34836480).

28963240 is an abundant number, since it is smaller than the sum of its proper divisors (40709720).

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

28963240 is a wasteful number, since it uses less digits than its factorization.

28963240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28963240 is about 5381.7506445394. The cubic root of 28963240 is about 307.1018134653.

The spelling of 28963240 in words is "twenty-eight million, nine hundred sixty-three thousand, two hundred forty".