28380372 has 48 divisors (see below), whose sum is σ = 68037312. Its totient is φ = 9204480.

The previous prime is 28380353. The next prime is 28380377. The reversal of 28380372 is 27308382.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100143 + ... + 100425.

It is an arithmetic number, because the mean of its divisors is an integer number (1417444).

Almost surely, 2^28380372 is an apocalyptic number.

It is an amenable number.

28380372 is an abundant number, since it is smaller than the sum of its proper divisors (39656940).

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

28380372 is a wasteful number, since it uses less digits than its factorization.

28380372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 28380372 is about 5327.3231552066. The cubic root of 28380372 is about 305.0277570367.

The spelling of 28380372 in words is "twenty-eight million, three hundred eighty thousand, three hundred seventy-two".