85724534 has 16 divisors (see below), whose sum is σ = 147197088. Its totient is φ = 36678912.

The previous prime is 85724501. The next prime is 85724539. The reversal of 85724534 is 43542758.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85724539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4454 + ... + 13830.

It is an arithmetic number, because the mean of its divisors is an integer number (9199818).

Almost surely, 2^85724534 is an apocalyptic number.

85724534 is a deficient number, since it is larger than the sum of its proper divisors (61472554).

85724534 is a wasteful number, since it uses less digits than its factorization.

85724534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10039.

The product of its digits is 134400, while the sum is 38.

The square root of 85724534 is about 9258.7544518688. The cubic root of 85724534 is about 440.9287098765.

The spelling of 85724534 in words is "eighty-five million, seven hundred twenty-four thousand, five hundred thirty-four".