28180657 has 2 divisors, whose sum is σ = 28180658. Its totient is φ = 28180656.

The previous prime is 28180631. The next prime is 28180661. The reversal of 28180657 is 75608182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 11826721 = 4044^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 28180657 - 2²³ = 19792049 is a prime.

It is equal to p_1751968 and since 28180657 and 1751968 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28180627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14090328 + 14090329.

It is an arithmetic number, because the mean of its divisors is an integer number (14090329).

Almost surely, 2^28180657 is an apocalyptic number.

It is an amenable number.

28180657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28180657 is an equidigital number, since it uses as much as digits as its factorization.

28180657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 28180657 is about 5308.5456577108. The cubic root of 28180657 is about 304.3105703343.

The spelling of 28180657 in words is "twenty-eight million, one hundred eighty thousand, six hundred fifty-seven".