28451520 has 224 divisors, whose sum is σ = 104241600. Its totient is φ = 7299072.

The previous prime is 28451519. The next prime is 28451539. The reversal of 28451520 is 2515482.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319636 + ... + 319724.

Almost surely, 2^28451520 is an apocalyptic number.

28451520 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 28451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52120800).

28451520 is an abundant number, since it is smaller than the sum of its proper divisors (75790080).

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

28451520 is a wasteful number, since it uses less digits than its factorization.

28451520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 28451520 is about 5333.9966254208. The cubic root of 28451520 is about 305.2824401530.

The spelling of 28451520 in words is "twenty-eight million, four hundred fifty-one thousand, five hundred twenty".