28731797 has 2 divisors, whose sum is σ = 28731798. Its totient is φ = 28731796.

The previous prime is 28731763. The next prime is 28731803. The reversal of 28731797 is 79713782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28633201 + 98596 = 5351^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 28731797 - 2⁶ = 28731733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28731707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365898 + 14365899.

It is an arithmetic number, because the mean of its divisors is an integer number (14365899).

Almost surely, 2^28731797 is an apocalyptic number.

It is an amenable number.

28731797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28731797 is an equidigital number, since it uses as much as digits as its factorization.

28731797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 44.

The square root of 28731797 is about 5360.2049401119. The cubic root of 28731797 is about 306.2816159502.

The spelling of 28731797 in words is "twenty-eight million, seven hundred thirty-one thousand, seven hundred ninety-seven".