28736145 has 12 divisors (see below), whose sum is σ = 49809396. Its totient is φ = 15325920.

The previous prime is 28736143. The next prime is 28736167. The reversal of 28736145 is 54163782.

It can be written as a sum of positive squares in 2 ways, for example, as 14470416 + 14265729 = 3804^2 + 3777^2 .

It is not a de Polignac number, because 28736145 - 2¹ = 28736143 is a prime.

It is a super-2 number, since 2×28736145² = 1651532058922050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28736143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319246 + ... + 319335.

It is an arithmetic number, because the mean of its divisors is an integer number (4150783).

Almost surely, 2^28736145 is an apocalyptic number.

It is an amenable number.

28736145 is a deficient number, since it is larger than the sum of its proper divisors (21073251).

28736145 is a wasteful number, since it uses less digits than its factorization.

28736145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638592 (or 638589 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28736145 is about 5360.6105062763. The cubic root of 28736145 is about 306.2970650975.

The spelling of 28736145 in words is "twenty-eight million, seven hundred thirty-six thousand, one hundred forty-five".