28771512 has 64 divisors (see below), whose sum is σ = 89683200. Its totient is φ = 7472640.

The previous prime is 28771511. The next prime is 28771517. The reversal of 28771512 is 21517782.

It is a super-2 number, since 2×28771512² = 1655599805532288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5937 + ... + 9632.

It is an arithmetic number, because the mean of its divisors is an integer number (1401300).

Almost surely, 2^28771512 is an apocalyptic number.

28771512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28771512 is an abundant number, since it is smaller than the sum of its proper divisors (60911688).

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

28771512 is a wasteful number, since it uses less digits than its factorization.

28771512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15596 (or 15592 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 28771512 is about 5363.9082766207. The cubic root of 28771512 is about 306.4226719152.

The spelling of 28771512 in words is "twenty-eight million, seven hundred seventy-one thousand, five hundred twelve".