28941840 has 80 divisors (see below), whose sum is σ = 99696000. Its totient is φ = 7717248.

The previous prime is 28941839. The next prime is 28941841. The reversal of 28941840 is 4814982.

It is an interprime number because it is at equal distance from previous prime (28941839) and next prime (28941841).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28941795 and 28941804.

It is not an unprimeable number, because it can be changed into a prime (28941841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4540 + ... + 8859.

It is an arithmetic number, because the mean of its divisors is an integer number (1246200).

Almost surely, 2^28941840 is an apocalyptic number.

28941840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28941840 is an abundant number, since it is smaller than the sum of its proper divisors (70754160).

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

28941840 is a wasteful number, since it uses less digits than its factorization.

28941840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13421 (or 13409 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28941840 is about 5379.7620765235. The cubic root of 28941840 is about 307.0261589681.

The spelling of 28941840 in words is "twenty-eight million, nine hundred forty-one thousand, eight hundred forty".