28402530 has 64 divisors (see below), whose sum is σ = 77293440. Its totient is φ = 6621696.

The previous prime is 28402519. The next prime is 28402531. The reversal of 28402530 is 3520482.

It is a self number, because there is not a number n which added to its sum of digits gives 28402530.

It is not an unprimeable number, because it can be changed into a prime (28402531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5494 + ... + 9326.

It is an arithmetic number, because the mean of its divisors is an integer number (1207710).

Almost surely, 2^28402530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28402530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38646720).

28402530 is an abundant number, since it is smaller than the sum of its proper divisors (48890910).

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

28402530 is a wasteful number, since it uses less digits than its factorization.

28402530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 28402530 is about 5329.4024055235. The cubic root of 28402530 is about 305.1071199478.

The spelling of 28402530 in words is "twenty-eight million, four hundred two thousand, five hundred thirty".