85511638 has 4 divisors (see below), whose sum is σ = 128267460. Its totient is φ = 42755818.

The previous prime is 85511623. The next prime is 85511639. The reversal of 85511638 is 83611558.

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

It is a junction number, because it is equal to n+sod(n) for n = 85511597 and 85511606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85511639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21377908 + ... + 21377911.

It is an arithmetic number, because the mean of its divisors is an integer number (32066865).

Almost surely, 2^85511638 is an apocalyptic number.

85511638 is a deficient number, since it is larger than the sum of its proper divisors (42755822).

85511638 is a wasteful number, since it uses less digits than its factorization.

85511638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42755821.

The product of its digits is 28800, while the sum is 37.

The square root of 85511638 is about 9247.2502940063. The cubic root of 85511638 is about 440.5633933149.

The spelling of 85511638 in words is "eighty-five million, five hundred eleven thousand, six hundred thirty-eight".