28923240 has 32 divisors (see below), whose sum is σ = 86770080. Its totient is φ = 7712832.

The previous prime is 28923227. The next prime is 28923241. The reversal of 28923240 is 4232982.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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 = 28923198 and 28923207.

It is not an unprimeable number, because it can be changed into a prime (28923241) 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 7 ways as a sum of consecutive naturals, for example, 120394 + ... + 120633.

It is an arithmetic number, because the mean of its divisors is an integer number (2711565).

Almost surely, 2^28923240 is an apocalyptic number.

28923240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28923240 is an abundant number, since it is smaller than the sum of its proper divisors (57846840).

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

28923240 is a wasteful number, since it uses less digits than its factorization.

28923240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241041 (or 241037 counting only the distinct ones).

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

The square root of 28923240 is about 5378.0330977040. The cubic root of 28923240 is about 306.9603728910.

The spelling of 28923240 in words is "twenty-eight million, nine hundred twenty-three thousand, two hundred forty".