28501657 has 2 divisors, whose sum is σ = 28501658. Its totient is φ = 28501656.

The previous prime is 28501621. The next prime is 28501663. The reversal of 28501657 is 75610582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26822041 + 1679616 = 5179^2 + 1296^2 .

It is a cyclic number.

It is not a de Polignac number, because 28501657 - 2¹⁵ = 28468889 is a prime.

It is not a weakly prime, because it can be changed into another prime (28501667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14250828 + 14250829.

It is an arithmetic number, because the mean of its divisors is an integer number (14250829).

Almost surely, 2^28501657 is an apocalyptic number.

It is an amenable number.

28501657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28501657 is an equidigital number, since it uses as much as digits as its factorization.

28501657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 28501657 is about 5338.6943160290. The cubic root of 28501657 is about 305.4616568677.

The spelling of 28501657 in words is "twenty-eight million, five hundred one thousand, six hundred fifty-seven".