28978357 has 2 divisors, whose sum is σ = 28978358. Its totient is φ = 28978356.

The previous prime is 28978343. The next prime is 28978361. The reversal of 28978357 is 75387982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17648401 + 11329956 = 4201^2 + 3366^2 .

It is a cyclic number.

It is not a de Polignac number, because 28978357 - 2¹¹ = 28976309 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28978357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28978307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14489178 + 14489179.

It is an arithmetic number, because the mean of its divisors is an integer number (14489179).

Almost surely, 2^28978357 is an apocalyptic number.

It is an amenable number.

28978357 is a deficient number, since it is larger than the sum of its proper divisors (1).

28978357 is an equidigital number, since it uses as much as digits as its factorization.

28978357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 28978357 is about 5383.1549299644. The cubic root of 28978357 is about 307.1552334862.

The spelling of 28978357 in words is "twenty-eight million, nine hundred seventy-eight thousand, three hundred fifty-seven".