28736401 has 2 divisors, whose sum is σ = 28736402. Its totient is φ = 28736400.

The previous prime is 28736399. The next prime is 28736413. The reversal of 28736401 is 10463782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 10246401 = 4300^2 + 3201^2 .

It is a cyclic number.

It is not a de Polignac number, because 28736401 - 2¹ = 28736399 is a prime.

Together with 28736399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28736431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14368200 + 14368201.

It is an arithmetic number, because the mean of its divisors is an integer number (14368201).

Almost surely, 2^28736401 is an apocalyptic number.

It is an amenable number.

28736401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28736401 is an equidigital number, since it uses as much as digits as its factorization.

28736401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 28736401 is about 5360.6343841004. The cubic root of 28736401 is about 306.2979746584.

The spelling of 28736401 in words is "twenty-eight million, seven hundred thirty-six thousand, four hundred one".