28923957731 has 2 divisors, whose sum is σ = 28923957732. Its totient is φ = 28923957730.

The previous prime is 28923957691. The next prime is 28923957757. The reversal of 28923957731 is 13775932982.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28923957731 - 2¹⁸ = 28923695587 is a prime.

It is a super-2 number, since 2×28923957731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28923957781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14461978865 + 14461978866.

It is an arithmetic number, because the mean of its divisors is an integer number (14461978866).

Almost surely, 2^28923957731 is an apocalyptic number.

28923957731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28923957731 is an equidigital number, since it uses as much as digits as its factorization.

28923957731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 56.

The spelling of 28923957731 in words is "twenty-eight billion, nine hundred twenty-three million, nine hundred fifty-seven thousand, seven hundred thirty-one".