28357016731 has 2 divisors, whose sum is σ = 28357016732. Its totient is φ = 28357016730.

The previous prime is 28357016717. The next prime is 28357016791. The reversal of 28357016731 is 13761075382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28357016731 - 2²³ = 28348628123 is a prime.

It is a super-2 number, since 2×28357016731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28357016791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178508365 + 14178508366.

It is an arithmetic number, because the mean of its divisors is an integer number (14178508366).

Almost surely, 2^28357016731 is an apocalyptic number.

28357016731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357016731 is an equidigital number, since it uses as much as digits as its factorization.

28357016731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 28357016731 in words is "twenty-eight billion, three hundred fifty-seven million, sixteen thousand, seven hundred thirty-one".