28742401 has 2 divisors, whose sum is σ = 28742402. Its totient is φ = 28742400.

The previous prime is 28742369. The next prime is 28742411. The reversal of 28742401 is 10424782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22316176 + 6426225 = 4724^2 + 2535^2 .

It is a cyclic number.

It is not a de Polignac number, because 28742401 - 2⁵ = 28742369 is a prime.

It is a super-2 number, since 2×28742401² = 1652251230489602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28742401.

It is not a weakly prime, because it can be changed into another prime (28742411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14371200 + 14371201.

It is an arithmetic number, because the mean of its divisors is an integer number (14371201).

Almost surely, 2^28742401 is an apocalyptic number.

It is an amenable number.

28742401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28742401 is an equidigital number, since it uses as much as digits as its factorization.

28742401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 28742401 is about 5361.1939901481. The cubic root of 28742401 is about 306.3192909436.

The spelling of 28742401 in words is "twenty-eight million, seven hundred forty-two thousand, four hundred one".