28736657 has 2 divisors, whose sum is σ = 28736658. Its totient is φ = 28736656.

The previous prime is 28736641. The next prime is 28736663. The reversal of 28736657 is 75663782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26173456 + 2563201 = 5116^2 + 1601^2 .

It is a cyclic number.

It is not a de Polignac number, because 28736657 - 2⁴ = 28736641 is a prime.

It is not a weakly prime, because it can be changed into another prime (28736627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14368328 + 14368329.

It is an arithmetic number, because the mean of its divisors is an integer number (14368329).

Almost surely, 2^28736657 is an apocalyptic number.

It is an amenable number.

28736657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28736657 is an equidigital number, since it uses as much as digits as its factorization.

28736657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 44.

The square root of 28736657 is about 5360.6582618182. The cubic root of 28736657 is about 306.2988842138.

The spelling of 28736657 in words is "twenty-eight million, seven hundred thirty-six thousand, six hundred fifty-seven".