28012380 has 48 divisors (see below), whose sum is σ = 85567104. Its totient is φ = 6790720.

The previous prime is 28012357. The next prime is 28012381. The reversal of 28012380 is 8321082.

It is a self number, because there is not a number n which added to its sum of digits gives 28012380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28012381) 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, 20562 + ... + 21881.

It is an arithmetic number, because the mean of its divisors is an integer number (1782648).

Almost surely, 2^28012380 is an apocalyptic number.

28012380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28012380 is an abundant number, since it is smaller than the sum of its proper divisors (57554724).

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

28012380 is a wasteful number, since it uses less digits than its factorization.

28012380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42466 (or 42464 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28012380 is about 5292.6722928970. The cubic root of 28012380 is about 303.7036441308.

The spelling of 28012380 in words is "twenty-eight million, twelve thousand, three hundred eighty".