28959840 has 432 divisors, whose sum is σ = 129493728. Its totient is φ = 5750784.

The previous prime is 28959839. The next prime is 28959841. The reversal of 28959840 is 4895982.

It is an interprime number because it is at equal distance from previous prime (28959839) and next prime (28959841).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28959841) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1703512 + ... + 1703528.

It is an arithmetic number, because the mean of its divisors is an integer number (299754).

Almost surely, 2^28959840 is an apocalyptic number.

28959840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28959840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64746864).

28959840 is an abundant number, since it is smaller than the sum of its proper divisors (100533888).

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

28959840 is a wasteful number, since it uses less digits than its factorization.

28959840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 28959840 is about 5381.4347529260. The cubic root of 28959840 is about 307.0897960825.

The spelling of 28959840 in words is "twenty-eight million, nine hundred fifty-nine thousand, eight hundred forty".