28163731 has 2 divisors, whose sum is σ = 28163732. Its totient is φ = 28163730.

The previous prime is 28163699. The next prime is 28163741. The reversal of 28163731 is 13736182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28163731 - 2⁵ = 28163699 is a prime.

It is a super-2 number, since 2×28163731² = 1586391487680722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28163693 and 28163702.

It is not a weakly prime, because it can be changed into another prime (28163741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081865 + 14081866.

It is an arithmetic number, because the mean of its divisors is an integer number (14081866).

Almost surely, 2^28163731 is an apocalyptic number.

28163731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28163731 is an equidigital number, since it uses as much as digits as its factorization.

28163731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 28163731 is about 5306.9511963085. The cubic root of 28163731 is about 304.2496326460.

The spelling of 28163731 in words is "twenty-eight million, one hundred sixty-three thousand, seven hundred thirty-one".