85781534 has 4 divisors (see below), whose sum is σ = 128672304. Its totient is φ = 42890766.

The previous prime is 85781477. The next prime is 85781543. The reversal of 85781534 is 43518758.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 85781491 and 85781500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21445382 + ... + 21445385.

It is an arithmetic number, because the mean of its divisors is an integer number (32168076).

Almost surely, 2^85781534 is an apocalyptic number.

85781534 is a deficient number, since it is larger than the sum of its proper divisors (42890770).

85781534 is a wasteful number, since it uses less digits than its factorization.

85781534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42890769.

The product of its digits is 134400, while the sum is 41.

The square root of 85781534 is about 9261.8321081738. The cubic root of 85781534 is about 441.0264157369.

The spelling of 85781534 in words is "eighty-five million, seven hundred eighty-one thousand, five hundred thirty-four".