28418940 has 144 divisors (see below), whose sum is σ = 97284096. Its totient is φ = 6652800.

The previous prime is 28418939. The next prime is 28418959. The reversal of 28418940 is 4981482.

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 = 28418895 and 28418904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61149 + ... + 61611.

It is an arithmetic number, because the mean of its divisors is an integer number (675584).

Almost surely, 2^28418940 is an apocalyptic number.

28418940 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 28418940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48642048).

28418940 is an abundant number, since it is smaller than the sum of its proper divisors (68865156).

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

28418940 is a wasteful number, since it uses less digits than its factorization.

28418940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 515 counting only the distinct ones).

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

The square root of 28418940 is about 5330.9417554500. The cubic root of 28418940 is about 305.1658687505.

It can be divided in two parts, 2841 and 8940, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 28418940 in words is "twenty-eight million, four hundred eighteen thousand, nine hundred forty".