28951145 has 8 divisors (see below), whose sum is σ = 35085960. Its totient is φ = 22931200.

The previous prime is 28951129. The next prime is 28951157. The reversal of 28951145 is 54115982.

It can be written as a sum of positive squares in 4 ways, for example, as 2859481 + 26091664 = 1691^2 + 5108^2 .

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

It is not a de Polignac number, because 28951145 - 2⁴ = 28951129 is a prime.

It is a super-2 number, since 2×28951145² = 1676337593622050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28160 + ... + 29169.

It is an arithmetic number, because the mean of its divisors is an integer number (4385745).

Almost surely, 2^28951145 is an apocalyptic number.

It is an amenable number.

28951145 is a deficient number, since it is larger than the sum of its proper divisors (6134815).

28951145 is a wasteful number, since it uses less digits than its factorization.

28951145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57435.

The product of its digits is 14400, while the sum is 35.

The square root of 28951145 is about 5380.6268222206. The cubic root of 28951145 is about 307.0590591142.

The spelling of 28951145 in words is "twenty-eight million, nine hundred fifty-one thousand, one hundred forty-five".