28531776 has 224 divisors, whose sum is σ = 98316288. Its totient is φ = 7096320.

The previous prime is 28531759. The next prime is 28531781. The reversal of 28531776 is 67713582.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 401821 + ... + 401891.

It is an arithmetic number, because the mean of its divisors is an integer number (438912).

Almost surely, 2^28531776 is an apocalyptic number.

28531776 is a gapful number since it is divisible by the number (26) 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 28531776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49158144).

28531776 is an abundant number, since it is smaller than the sum of its proper divisors (69784512).

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

28531776 is a wasteful number, since it uses less digits than its factorization.

28531776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 119 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 28531776 is about 5341.5143920053. The cubic root of 28531776 is about 305.5692174069.

The spelling of 28531776 in words is "twenty-eight million, five hundred thirty-one thousand, seven hundred seventy-six".