28020009431 has 2 divisors, whose sum is σ = 28020009432. Its totient is φ = 28020009430.

The previous prime is 28020009373. The next prime is 28020009443. The reversal of 28020009431 is 13490002082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28020009431 - 2¹⁴ = 28019993047 is a prime.

It is a super-2 number, since 2×28020009431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28020009394 and 28020009403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28020809431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14010004715 + 14010004716.

It is an arithmetic number, because the mean of its divisors is an integer number (14010004716).

Almost surely, 2^28020009431 is an apocalyptic number.

28020009431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28020009431 is an equidigital number, since it uses as much as digits as its factorization.

28020009431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 28020009431 in words is "twenty-eight billion, twenty million, nine thousand, four hundred thirty-one".