28155072 has 56 divisors (see below), whose sum is σ = 81271872. Its totient is φ = 8531200.

The previous prime is 28154999. The next prime is 28155073. The reversal of 28155072 is 27055182.

It is not an unprimeable number, because it can be changed into a prime (28155073) 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, 4554 + ... + 8777.

Almost surely, 2^28155072 is an apocalyptic number.

28155072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28155072 is an abundant number, since it is smaller than the sum of its proper divisors (53116800).

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

28155072 is a wasteful number, since it uses less digits than its factorization.

28155072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13357 (or 13347 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 28155072 is about 5306.1353167819. The cubic root of 28155072 is about 304.2184487141.

It can be divided in two parts, 2815 and 5072, that added together give a palindrome (7887).

The spelling of 28155072 in words is "twenty-eight million, one hundred fifty-five thousand, seventy-two".