28978373 has 2 divisors, whose sum is σ = 28978374. Its totient is φ = 28978372.

The previous prime is 28978361. The next prime is 28978393. The reversal of 28978373 is 37387982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23493409 + 5484964 = 4847^2 + 2342^2 .

It is a cyclic number.

It is not a de Polignac number, because 28978373 - 2⁴ = 28978357 is a prime.

It is a super-2 number, since 2×28978373² = 1679492203454258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28978343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14489186 + 14489187.

It is an arithmetic number, because the mean of its divisors is an integer number (14489187).

Almost surely, 2^28978373 is an apocalyptic number.

It is an amenable number.

28978373 is a deficient number, since it is larger than the sum of its proper divisors (1).

28978373 is an equidigital number, since it uses as much as digits as its factorization.

28978373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 28978373 is about 5383.1564160816. The cubic root of 28978373 is about 307.1552900167.

The spelling of 28978373 in words is "twenty-eight million, nine hundred seventy-eight thousand, three hundred seventy-three".