28840464 has 60 divisors (see below), whose sum is σ = 82909996. Its totient is φ = 9351936.

The previous prime is 28840463. The next prime is 28840477. The reversal of 28840464 is 46404882.

It can be written as a sum of positive squares in 2 ways, for example, as 16646400 + 12194064 = 4080^2 + 3492^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28840463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2622 + ... + 8034.

Almost surely, 2^28840464 is an apocalyptic number.

28840464 is a gapful number since it is divisible by the number (24) 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 28840464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41454998).

28840464 is an abundant number, since it is smaller than the sum of its proper divisors (54069532).

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

28840464 is a wasteful number, since it uses less digits than its factorization.

28840464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464 (or 5455 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 28840464 is about 5370.3318333228. The cubic root of 28840464 is about 306.6672610785.

The spelling of 28840464 in words is "twenty-eight million, eight hundred forty thousand, four hundred sixty-four".