28393031 has 2 divisors, whose sum is σ = 28393032. Its totient is φ = 28393030.

The previous prime is 28393003. The next prime is 28393037. The reversal of 28393031 is 13039382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28393031 is a prime.

It is a super-2 number, since 2×28393031² = 1612328418733922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28392985 and 28393003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28393037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14196515 + 14196516.

It is an arithmetic number, because the mean of its divisors is an integer number (14196516).

Almost surely, 2^28393031 is an apocalyptic number.

28393031 is a deficient number, since it is larger than the sum of its proper divisors (1).

28393031 is an equidigital number, since it uses as much as digits as its factorization.

28393031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 28393031 is about 5328.5111428991. The cubic root of 28393031 is about 305.0731026063.

The spelling of 28393031 in words is "twenty-eight million, three hundred ninety-three thousand, thirty-one".