28611601 has 2 divisors, whose sum is σ = 28611602. Its totient is φ = 28611600.

The previous prime is 28611599. The next prime is 28611659. The reversal of 28611601 is 10611682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26255376 + 2356225 = 5124^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 28611601 - 2¹ = 28611599 is a prime.

Together with 28611599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28611691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14305800 + 14305801.

It is an arithmetic number, because the mean of its divisors is an integer number (14305801).

Almost surely, 2^28611601 is an apocalyptic number.

It is an amenable number.

28611601 is a deficient number, since it is larger than the sum of its proper divisors (1).

28611601 is an equidigital number, since it uses as much as digits as its factorization.

28611601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 28611601 is about 5348.9813048841. The cubic root of 28611601 is about 305.8539216185.

The spelling of 28611601 in words is "twenty-eight million, six hundred eleven thousand, six hundred one".