28078735631 has 2 divisors, whose sum is σ = 28078735632. Its totient is φ = 28078735630.

The previous prime is 28078735621. The next prime is 28078735637. The reversal of 28078735631 is 13653787082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28078735631 - 2⁶ = 28078735567 is a prime.

It is a super-2 number, since 2×28078735631² (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 28078735631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28078735637) 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, 14039367815 + 14039367816.

It is an arithmetic number, because the mean of its divisors is an integer number (14039367816).

Almost surely, 2^28078735631 is an apocalyptic number.

28078735631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078735631 is an equidigital number, since it uses as much as digits as its factorization.

28078735631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 28078735631 in words is "twenty-eight billion, seventy-eight million, seven hundred thirty-five thousand, six hundred thirty-one".