28571500 has 24 divisors (see below), whose sum is σ = 62401248. Its totient is φ = 11428400.

The previous prime is 28571489. The next prime is 28571503. The reversal of 28571500 is 517582.

It is a super-2 number, since 2×28571500² = 1632661224500000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28571503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28072 + ... + 29071.

It is an arithmetic number, because the mean of its divisors is an integer number (2600052).

Almost surely, 2^28571500 is an apocalyptic number.

28571500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28571500 is an abundant number, since it is smaller than the sum of its proper divisors (33829748).

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

28571500 is a wasteful number, since it uses less digits than its factorization.

28571500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57162 (or 57150 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 28571500 is about 5345.2315197754. The cubic root of 28571500 is about 305.7109634916.

The spelling of 28571500 in words is "twenty-eight million, five hundred seventy-one thousand, five hundred".