28010500 has 96 divisors (see below), whose sum is σ = 71705088. Its totient is φ = 9360000.

The previous prime is 28010497. The next prime is 28010531. The reversal of 28010500 is 501082.

It is a happy number.

It is a super-2 number, since 2×28010500² = 1569176220500000, which contains 22 as substring.

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, 185425 + ... + 185575.

It is an arithmetic number, because the mean of its divisors is an integer number (746928).

Almost surely, 2^28010500 is an apocalyptic number.

28010500 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 28010500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35852544).

28010500 is an abundant number, since it is smaller than the sum of its proper divisors (43694588).

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

28010500 is a wasteful number, since it uses less digits than its factorization.

28010500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 28010500 is about 5292.4946858736. The cubic root of 28010500 is about 303.6968498060.

Adding to 28010500 its reverse (501082), we get a palindrome (28511582).

The spelling of 28010500 in words is "twenty-eight million, ten thousand, five hundred".