28313988 has 12 divisors (see below), whose sum is σ = 66066000. Its totient is φ = 9437992.

The previous prime is 28313983. The next prime is 28314001. The reversal of 28313988 is 88931382.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (28313983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179738 + ... + 1179761.

It is an arithmetic number, because the mean of its divisors is an integer number (5505500).

Almost surely, 2^28313988 is an apocalyptic number.

It is an amenable number.

28313988 is an abundant number, since it is smaller than the sum of its proper divisors (37752012).

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

28313988 is a wasteful number, since it uses less digits than its factorization.

28313988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359506 (or 2359504 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 28313988 is about 5321.0889862884. The cubic root of 28313988 is about 304.7897431121.

The spelling of 28313988 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred eighty-eight".