85428947 has 2 divisors, whose sum is σ = 85428948. Its totient is φ = 85428946.

The previous prime is 85428943. The next prime is 85428989. The reversal of 85428947 is 74982458.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85428947 - 2² = 85428943 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (85428943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42714473 + 42714474.

It is an arithmetic number, because the mean of its divisors is an integer number (42714474).

Almost surely, 2^85428947 is an apocalyptic number.

85428947 is a deficient number, since it is larger than the sum of its proper divisors (1).

85428947 is an equidigital number, since it uses as much as digits as its factorization.

85428947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 47.

The square root of 85428947 is about 9242.7780996841. The cubic root of 85428947 is about 440.4213371079.

The spelling of 85428947 in words is "eighty-five million, four hundred twenty-eight thousand, nine hundred forty-seven".