28377389 has 2 divisors, whose sum is σ = 28377390. Its totient is φ = 28377388.

The previous prime is 28377379. The next prime is 28377413. The reversal of 28377389 is 98377382.

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., 28249225 + 128164 = 5315^2 + 358^2 .

It is a cyclic number.

It is not a de Polignac number, because 28377389 - 2⁴ = 28377373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28377319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14188694 + 14188695.

It is an arithmetic number, because the mean of its divisors is an integer number (14188695).

Almost surely, 2^28377389 is an apocalyptic number.

It is an amenable number.

28377389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28377389 is an equidigital number, since it uses as much as digits as its factorization.

28377389 is an evil number, because the sum of its binary digits is even.

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

The square root of 28377389 is about 5327.0431760968. The cubic root of 28377389 is about 305.0170697246.

The spelling of 28377389 in words is "twenty-eight million, three hundred seventy-seven thousand, three hundred eighty-nine".