28400971 has 2 divisors, whose sum is σ = 28400972. Its totient is φ = 28400970.

The previous prime is 28400963. The next prime is 28401013. The reversal of 28400971 is 17900482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28400971 - 2³ = 28400963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28430971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200485 + 14200486.

It is an arithmetic number, because the mean of its divisors is an integer number (14200486).

Almost surely, 2^28400971 is an apocalyptic number.

28400971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400971 is an equidigital number, since it uses as much as digits as its factorization.

28400971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28400971 is about 5329.2561394626. The cubic root of 28400971 is about 305.1015374557.

The spelling of 28400971 in words is "twenty-eight million, four hundred thousand, nine hundred seventy-one".