28408824 has 48 divisors (see below), whose sum is σ = 77321400. Its totient is φ = 9422784.

The previous prime is 28408801. The next prime is 28408847. The reversal of 28408824 is 42880482.

It is an interprime number because it is at equal distance from previous prime (28408801) and next prime (28408847).

It is a super-2 number, since 2×28408824² = 1614122562125952, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15627 + ... + 17349.

Almost surely, 2^28408824 is an apocalyptic number.

28408824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28408824 is an abundant number, since it is smaller than the sum of its proper divisors (48912576).

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

28408824 is a wasteful number, since it uses less digits than its factorization.

28408824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 28408824 is about 5329.9928705393. The cubic root of 28408824 is about 305.1296555269.

It can be divided in two parts, 2840 and 8824, that added together give a square (11664 = 108²).

The spelling of 28408824 in words is "twenty-eight million, four hundred eight thousand, eight hundred twenty-four".