28978992 has 180 divisors, whose sum is σ = 99446760. Its totient is φ = 8055936.

The previous prime is 28978991. The next prime is 28978993. The reversal of 28978992 is 29987982.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (28978991) and next prime (28978993).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28978991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 783198 + ... + 783234.

It is an arithmetic number, because the mean of its divisors is an integer number (552482).

Almost surely, 2^28978992 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 28978992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49723380).

28978992 is an abundant number, since it is smaller than the sum of its proper divisors (70467768).

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

28978992 is a wasteful number, since it uses less digits than its factorization.

28978992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 49 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 28978992 is about 5383.2139099241. The cubic root of 28978992 is about 307.1574770243.

The spelling of 28978992 in words is "twenty-eight million, nine hundred seventy-eight thousand, nine hundred ninety-two".