28177493 has 2 divisors, whose sum is σ = 28177494. Its totient is φ = 28177492.

The previous prime is 28177477. The next prime is 28177529. The reversal of 28177493 is 39477182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27269284 + 908209 = 5222^2 + 953^2 .

It is a cyclic number.

It is not a de Polignac number, because 28177493 - 2⁴ = 28177477 is a prime.

It is a super-2 number, since 2×28177493² = 1587942223530098, which contains 22 as substring.

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 28177493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28177403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14088746 + 14088747.

It is an arithmetic number, because the mean of its divisors is an integer number (14088747).

Almost surely, 2^28177493 is an apocalyptic number.

It is an amenable number.

28177493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28177493 is an equidigital number, since it uses as much as digits as its factorization.

28177493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 28177493 is about 5308.2476392874. The cubic root of 28177493 is about 304.2991810248.

The spelling of 28177493 in words is "twenty-eight million, one hundred seventy-seven thousand, four hundred ninety-three".