28641157 has 2 divisors, whose sum is σ = 28641158. Its totient is φ = 28641156.

The previous prime is 28641101. The next prime is 28641161. The reversal of 28641157 is 75114682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23483716 + 5157441 = 4846^2 + 2271^2 .

It is a cyclic number.

It is not a de Polignac number, because 28641157 - 2⁷ = 28641029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28641257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14320578 + 14320579.

It is an arithmetic number, because the mean of its divisors is an integer number (14320579).

Almost surely, 2^28641157 is an apocalyptic number.

It is an amenable number.

28641157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28641157 is an equidigital number, since it uses as much as digits as its factorization.

28641157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 28641157 is about 5351.7433608124. The cubic root of 28641157 is about 305.9592018457.

The spelling of 28641157 in words is "twenty-eight million, six hundred forty-one thousand, one hundred fifty-seven".