28408957 has 2 divisors, whose sum is σ = 28408958. Its totient is φ = 28408956.

The previous prime is 28408943. The next prime is 28408967. The reversal of 28408957 is 75980482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 7806436 = 4539^2 + 2794^2 .

It is a cyclic number.

It is not a de Polignac number, because 28408957 - 2¹⁵ = 28376189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28408907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14204478 + 14204479.

It is an arithmetic number, because the mean of its divisors is an integer number (14204479).

Almost surely, 2^28408957 is an apocalyptic number.

It is an amenable number.

28408957 is a deficient number, since it is larger than the sum of its proper divisors (1).

28408957 is an equidigital number, since it uses as much as digits as its factorization.

28408957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28408957 is about 5330.0053470893. The cubic root of 28408957 is about 305.1301316956.

The spelling of 28408957 in words is "twenty-eight million, four hundred eight thousand, nine hundred fifty-seven".