28551145 has 16 divisors (see below), whose sum is σ = 39507840. Its totient is φ = 19401984.

The previous prime is 28551139. The next prime is 28551151. The reversal of 28551145 is 54115582.

It is an interprime number because it is at equal distance from previous prime (28551139) and next prime (28551151).

It is not a de Polignac number, because 28551145 - 2¹⁵ = 28518377 is a prime.

It is a super-2 number, since 2×28551145² = 1630335761622050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (2469240).

Almost surely, 2^28551145 is an apocalyptic number.

It is an amenable number.

28551145 is a deficient number, since it is larger than the sum of its proper divisors (10956695).

28551145 is a wasteful number, since it uses less digits than its factorization.

28551145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7344.

The product of its digits is 8000, while the sum is 31.

The square root of 28551145 is about 5343.3271470124. The cubic root of 28551145 is about 305.6383477149.

The spelling of 28551145 in words is "twenty-eight million, five hundred fifty-one thousand, one hundred forty-five".