28107687731 has 2 divisors, whose sum is σ = 28107687732. Its totient is φ = 28107687730.

The previous prime is 28107687697. The next prime is 28107687739. The reversal of 28107687731 is 13778670182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28107687731 - 2⁶ = 28107687667 is a prime.

It is a super-2 number, since 2×28107687731² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28107687731.

It is not a weakly prime, because it can be changed into another prime (28107687739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14053843865 + 14053843866.

It is an arithmetic number, because the mean of its divisors is an integer number (14053843866).

Almost surely, 2^28107687731 is an apocalyptic number.

28107687731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28107687731 is an equidigital number, since it uses as much as digits as its factorization.

28107687731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 28107687731 in words is "twenty-eight billion, one hundred seven million, six hundred eighty-seven thousand, seven hundred thirty-one".