28646040 has 128 divisors (see below), whose sum is σ = 91445760. Its totient is φ = 7163904.

The previous prime is 28646021. The next prime is 28646047. The reversal of 28646040 is 4064682.

28646040 = T₁₉₆ + T₁₉₇ + ... + T₅₆₃.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28645989 and 28646007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28646047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267667 + ... + 267773.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^28646040 is an apocalyptic number.

28646040 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 28646040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45722880).

28646040 is an abundant number, since it is smaller than the sum of its proper divisors (62799720).

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

28646040 is a wasteful number, since it uses less digits than its factorization.

28646040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 28646040 is about 5352.1995478495. The cubic root of 28646040 is about 305.9765884092.

The spelling of 28646040 in words is "twenty-eight million, six hundred forty-six thousand, forty".