28646531 has 2 divisors, whose sum is σ = 28646532. Its totient is φ = 28646530.

The previous prime is 28646507. The next prime is 28646539. The reversal of 28646531 is 13564682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28646531 - 2⁶ = 28646467 is a prime.

It is a super-2 number, since 2×28646531² = 1641247476667922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28646491 and 28646500.

It is not a weakly prime, because it can be changed into another prime (28646539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323265 + 14323266.

It is an arithmetic number, because the mean of its divisors is an integer number (14323266).

Almost surely, 2^28646531 is an apocalyptic number.

28646531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28646531 is an equidigital number, since it uses as much as digits as its factorization.

28646531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 28646531 is about 5352.2454166452. The cubic root of 28646531 is about 305.9783365699.

The spelling of 28646531 in words is "twenty-eight million, six hundred forty-six thousand, five hundred thirty-one".