28731973 has 2 divisors, whose sum is σ = 28731974. Its totient is φ = 28731972.

The previous prime is 28731949. The next prime is 28731977. The reversal of 28731973 is 37913782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24980004 + 3751969 = 4998^2 + 1937^2 .

It is a cyclic number.

It is not a de Polignac number, because 28731973 - 2¹³ = 28723781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28731977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365986 + 14365987.

It is an arithmetic number, because the mean of its divisors is an integer number (14365987).

Almost surely, 2^28731973 is an apocalyptic number.

It is an amenable number.

28731973 is a deficient number, since it is larger than the sum of its proper divisors (1).

28731973 is an equidigital number, since it uses as much as digits as its factorization.

28731973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 28731973 is about 5360.2213573695. The cubic root of 28731973 is about 306.2822413369.

The spelling of 28731973 in words is "twenty-eight million, seven hundred thirty-one thousand, nine hundred seventy-three".