28731580 has 24 divisors (see below), whose sum is σ = 60554592. Its totient is φ = 11451072.

The previous prime is 28731569. The next prime is 28731583. The reversal of 28731580 is 8513782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3409 + ... + 8311.

It is an arithmetic number, because the mean of its divisors is an integer number (2523108).

Almost surely, 2^28731580 is an apocalyptic number.

28731580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28731580 is an abundant number, since it is smaller than the sum of its proper divisors (31823012).

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

28731580 is a wasteful number, since it uses less digits than its factorization.

28731580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205 (or 5203 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28731580 is about 5360.1846983103. The cubic root of 28731580 is about 306.2808448733.

The spelling of 28731580 in words is "twenty-eight million, seven hundred thirty-one thousand, five hundred eighty".