28329040 has 40 divisors (see below), whose sum is σ = 67995648. Its totient is φ = 10965120.

The previous prime is 28329029. The next prime is 28329047. The reversal of 28329040 is 4092382.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28329047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3232 + ... + 8191.

Almost surely, 2^28329040 is an apocalyptic number.

28329040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28329040 is an abundant number, since it is smaller than the sum of its proper divisors (39666608).

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

28329040 is a wasteful number, since it uses less digits than its factorization.

28329040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11467 (or 11461 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28329040 is about 5322.5031705016. The cubic root of 28329040 is about 304.8437433057.

The spelling of 28329040 in words is "twenty-eight million, three hundred twenty-nine thousand, forty".