28572155 has 8 divisors (see below), whose sum is σ = 36303552. Its totient is φ = 21513088.

The previous prime is 28572151. The next prime is 28572157. The reversal of 28572155 is 55127582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28572155 - 2² = 28572151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28572151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167987 + ... + 168156.

It is an arithmetic number, because the mean of its divisors is an integer number (4537944).

Almost surely, 2^28572155 is an apocalyptic number.

28572155 is a deficient number, since it is larger than the sum of its proper divisors (7731397).

28572155 is a wasteful number, since it uses less digits than its factorization.

28572155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336165.

The product of its digits is 28000, while the sum is 35.

The square root of 28572155 is about 5345.2927889873. The cubic root of 28572155 is about 305.7132996092.

The spelling of 28572155 in words is "twenty-eight million, five hundred seventy-two thousand, one hundred fifty-five".