85744642 has 4 divisors (see below), whose sum is σ = 128616966. Its totient is φ = 42872320.

The previous prime is 85744639. The next prime is 85744661. The reversal of 85744642 is 24644758.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 84805681 + 938961 = 9209^2 + 969^2 .

It is a junction number, because it is equal to n+sod(n) for n = 85744595 and 85744604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21436159 + ... + 21436162.

Almost surely, 2^85744642 is an apocalyptic number.

85744642 is a deficient number, since it is larger than the sum of its proper divisors (42872324).

85744642 is a wasteful number, since it uses less digits than its factorization.

85744642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42872323.

The product of its digits is 215040, while the sum is 40.

The square root of 85744642 is about 9259.8402794001. The cubic root of 85744642 is about 440.9631827046.

The spelling of 85744642 in words is "eighty-five million, seven hundred forty-four thousand, six hundred forty-two".