28970145 has 12 divisors (see below), whose sum is σ = 50214996. Its totient is φ = 15450720.

The previous prime is 28970119. The next prime is 28970147. The reversal of 28970145 is 54107982.

It can be written as a sum of positive squares in 2 ways, for example, as 17740944 + 11229201 = 4212^2 + 3351^2 .

It is not a de Polignac number, because 28970145 - 2⁷ = 28970017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28970147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 321846 + ... + 321935.

It is an arithmetic number, because the mean of its divisors is an integer number (4184583).

Almost surely, 2^28970145 is an apocalyptic number.

It is an amenable number.

28970145 is a deficient number, since it is larger than the sum of its proper divisors (21244851).

28970145 is a wasteful number, since it uses less digits than its factorization.

28970145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643792 (or 643789 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28970145 is about 5382.3921261833. The cubic root of 28970145 is about 307.1262164618.

Adding to 28970145 its product of nonzero digits (20160), we get a triangular number (28990305 = T₇₆₁₄).

The spelling of 28970145 in words is "twenty-eight million, nine hundred seventy thousand, one hundred forty-five".