28265040 has 120 divisors (see below), whose sum is σ = 97580808. Its totient is φ = 7326720.

The previous prime is 28265023. The next prime is 28265057. The reversal of 28265040 is 4056282.

28265040 = T₁₉₁ + T₁₉₂ + ... + T₅₆₀.

28265040 is a `hidden beast` number, since 2 + 8 + 2 + 650 + 4 + 0 = 666.

28265040 is nontrivially palindromic in base 11.

It is an interprime number because it is at equal distance from previous prime (28265023) and next prime (28265057).

It can be written as a sum of positive squares in 4 ways, for example, as 9809424 + 18455616 = 3132^2 + 4296^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 28264995 and 28265013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26110 + ... + 27170.

Almost surely, 2^28265040 is an apocalyptic number.

28265040 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 28265040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48790404).

28265040 is an abundant number, since it is smaller than the sum of its proper divisors (69315768).

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

28265040 is a wasteful number, since it uses less digits than its factorization.

28265040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117 (or 1108 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28265040 is about 5316.4875622915. The cubic root of 28265040 is about 304.6140060214.

The spelling of 28265040 in words is "twenty-eight million, two hundred sixty-five thousand, forty".