28488440 has 64 divisors (see below), whose sum is σ = 68040000. Its totient is φ = 10716160.

The previous prime is 28488437. The next prime is 28488457. The reversal of 28488440 is 4488482.

It is a junction number, because it is equal to n+sod(n) for n = 28488394 and 28488403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47261 + ... + 47859.

It is an arithmetic number, because the mean of its divisors is an integer number (1063125).

Almost surely, 2^28488440 is an apocalyptic number.

28488440 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 28488440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34020000).

28488440 is an abundant number, since it is smaller than the sum of its proper divisors (39551560).

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

28488440 is a wasteful number, since it uses less digits than its factorization.

28488440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 38.

The square root of 28488440 is about 5337.4563230063. The cubic root of 28488440 is about 305.4144325847.

The spelling of 28488440 in words is "twenty-eight million, four hundred eighty-eight thousand, four hundred forty".