85209425 has 24 divisors (see below), whose sum is σ = 123045696. Its totient is φ = 57320640.

The previous prime is 85209419. The next prime is 85209427. The reversal of 85209425 is 52490258.

It is a happy number.

It is not a de Polignac number, because 85209425 - 2⁸ = 85209169 is a prime.

It is a super-2 number, since 2×85209425² = 14521292217661250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85209427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4682 + ... + 13868.

It is an arithmetic number, because the mean of its divisors is an integer number (5126904).

Almost surely, 2^85209425 is an apocalyptic number.

It is an amenable number.

85209425 is a deficient number, since it is larger than the sum of its proper divisors (37836271).

85209425 is a wasteful number, since it uses less digits than its factorization.

85209425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9257 (or 9252 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 85209425 is about 9230.8951353593. The cubic root of 85209425 is about 440.0437714719.

The spelling of 85209425 in words is "eighty-five million, two hundred nine thousand, four hundred twenty-five".