28554240 has 264 divisors, whose sum is σ = 107885088. Its totient is φ = 6389760.

The previous prime is 28554223. The next prime is 28554257. The reversal of 28554240 is 4245582.

It is an interprime number because it is at equal distance from previous prime (28554223) and next prime (28554257).

It is a tau number, because it is divible by the number of its divisors (264).

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 = 28554198 and 28554207.

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, 2196474 + ... + 2196486.

Almost surely, 2^28554240 is an apocalyptic number.

28554240 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 28554240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53942544).

28554240 is an abundant number, since it is smaller than the sum of its proper divisors (79330848).

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

28554240 is a wasteful number, since it uses less digits than its factorization.

28554240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 28554240 is about 5343.6167527247. The cubic root of 28554240 is about 305.6493912476.

It can be divided in two parts, 285542 and 40, that added together give a palindrome (285582).

The spelling of 28554240 in words is "twenty-eight million, five hundred fifty-four thousand, two hundred forty".