85720220164 has 24 divisors (see below), whose sum is σ = 158849056800. Its totient is φ = 40335236736.

The previous prime is 85720220161. The next prime is 85720220191. The reversal of 85720220164 is 46102202758.

It is a happy number.

It is a super-2 number, since 2×85720220164² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85720220161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 779887 + ... + 882985.

It is an arithmetic number, because the mean of its divisors is an integer number (6618710700).

Almost surely, 2^85720220164 is an apocalyptic number.

It is an amenable number.

85720220164 is a deficient number, since it is larger than the sum of its proper divisors (73128836636).

85720220164 is a wasteful number, since it uses less digits than its factorization.

85720220164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115347 (or 115345 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 85720220164 in words is "eighty-five billion, seven hundred twenty million, two hundred twenty thousand, one hundred sixty-four".