85644738 has 12 divisors (see below), whose sum is σ = 185563638. Its totient is φ = 28548240.

The previous prime is 85644737. The next prime is 85644739. The reversal of 85644738 is 83744658.

It is an interprime number because it is at equal distance from previous prime (85644737) and next prime (85644739).

It can be written as a sum of positive squares in only one way, i.e., 46744569 + 38900169 = 6837^2 + 6237^2 .

It is a super-2 number, since 2×85644738² = 14670042294177288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85644693 and 85644702.

It is not an unprimeable number, because it can be changed into a prime (85644731) 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 5 ways as a sum of consecutive naturals, for example, 2379003 + ... + 2379038.

Almost surely, 2^85644738 is an apocalyptic number.

85644738 is an abundant number, since it is smaller than the sum of its proper divisors (99918900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85644738 is a wasteful number, since it uses less digits than its factorization.

85644738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4758049 (or 4758046 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 85644738 is about 9254.4442296661. Note that the first 3 decimals coincide. The cubic root of 85644738 is about 440.7918557448.

The spelling of 85644738 in words is "eighty-five million, six hundred forty-four thousand, seven hundred thirty-eight".