28551320 has 64 divisors (see below), whose sum is σ = 74952000. Its totient is φ = 9784320.

The previous prime is 28551287. The next prime is 28551323. The reversal of 28551320 is 2315582.

It is a self number, because there is not a number n which added to its sum of digits gives 28551320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28551323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12680 + ... + 14760.

It is an arithmetic number, because the mean of its divisors is an integer number (1171125).

Almost surely, 2^28551320 is an apocalyptic number.

28551320 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 28551320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37476000).

28551320 is an abundant number, since it is smaller than the sum of its proper divisors (46400680).

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

28551320 is a wasteful number, since it uses less digits than its factorization.

28551320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113 (or 2095 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 28551320 is about 5343.3435225521. The cubic root of 28551320 is about 305.6389721686.

The spelling of 28551320 in words is "twenty-eight million, five hundred fifty-one thousand, three hundred twenty".