28329240 has 32 divisors (see below), whose sum is σ = 84988080. Its totient is φ = 7554432.

The previous prime is 28329229. The next prime is 28329253. The reversal of 28329240 is 4292382.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28329198 and 28329207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117919 + ... + 118158.

Almost surely, 2^28329240 is an apocalyptic number.

28329240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28329240 is an abundant number, since it is smaller than the sum of its proper divisors (56658840).

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

28329240 is a wasteful number, since it uses less digits than its factorization.

28329240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236091 (or 236087 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28329240 is about 5322.5219586207. The cubic root of 28329240 is about 304.8444606921.

The spelling of 28329240 in words is "twenty-eight million, three hundred twenty-nine thousand, two hundred forty".