28901213 has 6 divisors (see below), whose sum is σ = 31767582. Its totient is φ = 26273720.

The previous prime is 28901177. The next prime is 28901221. The reversal of 28901213 is 31210982.

It can be written as a sum of positive squares in only one way, i.e., 15077689 + 13823524 = 3883^2 + 3718^2 .

It is not a de Polignac number, because 28901213 - 2⁶ = 28901149 is a prime.

It is a super-2 number, since 2×28901213² = 1670560225742738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28901233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119306 + ... + 119547.

It is an arithmetic number, because the mean of its divisors is an integer number (5294597).

Almost surely, 2^28901213 is an apocalyptic number.

It is an amenable number.

28901213 is a deficient number, since it is larger than the sum of its proper divisors (2866369).

28901213 is a wasteful number, since it uses less digits than its factorization.

28901213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238875 (or 238864 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 28901213 is about 5375.9848400084. The cubic root of 28901213 is about 306.8824294185.

The spelling of 28901213 in words is "twenty-eight million, nine hundred one thousand, two hundred thirteen".