28425431 has 2 divisors, whose sum is σ = 28425432. Its totient is φ = 28425430.

The previous prime is 28425427. The next prime is 28425473. The reversal of 28425431 is 13452482.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28425431 - 2² = 28425427 is a prime.

It is a super-2 number, since 2×28425431² = 1616010255071522, 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 = 28425394 and 28425403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28425491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14212715 + 14212716.

It is an arithmetic number, because the mean of its divisors is an integer number (14212716).

Almost surely, 2^28425431 is an apocalyptic number.

28425431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28425431 is an equidigital number, since it uses as much as digits as its factorization.

28425431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 29.

The square root of 28425431 is about 5331.5505249411. The cubic root of 28425431 is about 305.1891006851.

The spelling of 28425431 in words is "twenty-eight million, four hundred twenty-five thousand, four hundred thirty-one".