85728730 has 16 divisors (see below), whose sum is σ = 154873800. Its totient is φ = 34166592.

The previous prime is 85728707. The next prime is 85728743. The reversal of 85728730 is 3782758.

It can be written as a sum of positive squares in 4 ways, for example, as 75533481 + 10195249 = 8691^2 + 3193^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12705 + ... + 18244.

Almost surely, 2^85728730 is an apocalyptic number.

85728730 is a deficient number, since it is larger than the sum of its proper divisors (69145070).

85728730 is a wasteful number, since it uses less digits than its factorization.

85728730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31233.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 85728730 is about 9258.9810454499. The cubic root of 85728730 is about 440.9359038757.

The spelling of 85728730 in words is "eighty-five million, seven hundred twenty-eight thousand, seven hundred thirty".