28390968 has 24 divisors (see below), whose sum is σ = 76892400. Its totient is φ = 9463632.

The previous prime is 28390939. The next prime is 28390979. The reversal of 28390968 is 86909382.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197088 + ... + 197231.

It is an arithmetic number, because the mean of its divisors is an integer number (3203850).

Almost surely, 2^28390968 is an apocalyptic number.

It is an amenable number.

28390968 is an abundant number, since it is smaller than the sum of its proper divisors (48501432).

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

28390968 is a wasteful number, since it uses less digits than its factorization.

28390968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394331 (or 394324 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 28390968 is about 5328.3175581041. The cubic root of 28390968 is about 305.0657136916.

The spelling of 28390968 in words is "twenty-eight million, three hundred ninety thousand, nine hundred sixty-eight".