28380402 has 32 divisors (see below), whose sum is σ = 63639360. Its totient is φ = 9374400.

The previous prime is 28380397. The next prime is 28380421. The reversal of 28380402 is 20408382.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3777 + ... + 8427.

It is an arithmetic number, because the mean of its divisors is an integer number (1988730).

Almost surely, 2^28380402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28380402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31819680).

28380402 is an abundant number, since it is smaller than the sum of its proper divisors (35258958).

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

28380402 is a wasteful number, since it uses less digits than its factorization.

28380402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775 (or 4769 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28380402 is about 5327.3259708788. The cubic root of 28380402 is about 305.0278645151.

Adding to 28380402 its reverse (20408382), we get a palindrome (48788784).

It can be divided in two parts, 28380 and 402, that added together give a palindrome (28782).

The spelling of 28380402 in words is "twenty-eight million, three hundred eighty thousand, four hundred two".