28317380 has 48 divisors (see below), whose sum is σ = 73194240. Its totient is φ = 8961408.

The previous prime is 28317379. The next prime is 28317383. The reversal of 28317380 is 8371382.

It is not an unprimeable number, because it can be changed into a prime (28317383) 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, 5960 + ... + 9599.

It is an arithmetic number, because the mean of its divisors is an integer number (1524880).

Almost surely, 2^28317380 is an apocalyptic number.

28317380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28317380 is an abundant number, since it is smaller than the sum of its proper divisors (44876860).

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

28317380 is a wasteful number, since it uses less digits than its factorization.

28317380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15588 (or 15586 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28317380 is about 5321.4077084922. The cubic root of 28317380 is about 304.8019138400.

The spelling of 28317380 in words is "twenty-eight million, three hundred seventeen thousand, three hundred eighty".