85221784 has 8 divisors (see below), whose sum is σ = 159790860. Its totient is φ = 42610888.

The previous prime is 85221751. The next prime is 85221811. The reversal of 85221784 is 48712258.

It is a tau number, because it is divible by the number of its divisors (8).

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, 5326354 + ... + 5326369.

Almost surely, 2^85221784 is an apocalyptic number.

It is an amenable number.

85221784 is a deficient number, since it is larger than the sum of its proper divisors (74569076).

85221784 is a wasteful number, since it uses less digits than its factorization.

85221784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10652729 (or 10652725 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 85221784 is about 9231.5645477893. The cubic root of 85221784 is about 440.0650454802.

The spelling of 85221784 in words is "eighty-five million, two hundred twenty-one thousand, seven hundred eighty-four".