28790731 has 2 divisors, whose sum is σ = 28790732. Its totient is φ = 28790730.

The previous prime is 28790659. The next prime is 28790753. The reversal of 28790731 is 13709782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28790731 - 2⁹ = 28790219 is a prime.

It is a super-2 number, since 2×28790731² = 1657812383028722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28790431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14395365 + 14395366.

It is an arithmetic number, because the mean of its divisors is an integer number (14395366).

Almost surely, 2^28790731 is an apocalyptic number.

28790731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28790731 is an equidigital number, since it uses as much as digits as its factorization.

28790731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 28790731 is about 5365.6994884171. The cubic root of 28790731 is about 306.4908855303.

The spelling of 28790731 in words is "twenty-eight million, seven hundred ninety thousand, seven hundred thirty-one".