28103040 has 384 divisors, whose sum is σ = 120294720. Its totient is φ = 5898240.

The previous prime is 28103003. The next prime is 28103077. The reversal of 28103040 is 4030182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28103003) and next prime (28103077).

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 685420 + ... + 685460.

Almost surely, 2^28103040 is an apocalyptic number.

28103040 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 28103040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60147360).

28103040 is an abundant number, since it is smaller than the sum of its proper divisors (92191680).

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

28103040 is a wasteful number, since it uses less digits than its factorization.

28103040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28103040 is about 5301.2300459422. The cubic root of 28103040 is about 304.0309294477.

The spelling of 28103040 in words is "twenty-eight million, one hundred three thousand, forty".