28311976 has 128 divisors (see below), whose sum is σ = 72576000. Its totient is φ = 10022400.

The previous prime is 28311973. The next prime is 28312003. The reversal of 28311976 is 67911382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 479835 + ... + 479893.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^28311976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28311976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

28311976 is an abundant number, since it is smaller than the sum of its proper divisors (44264024).

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

28311976 is a wasteful number, since it uses less digits than its factorization.

28311976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 139 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 28311976 is about 5320.8999238851. The cubic root of 28311976 is about 304.7825234593.

The spelling of 28311976 in words is "twenty-eight million, three hundred eleven thousand, nine hundred seventy-six".