85554721 has 12 divisors (see below), whose sum is σ = 98951872. Its totient is φ = 72461664.

The previous prime is 85554713. The next prime is 85554731. The reversal of 85554721 is 12745558.

It is not a de Polignac number, because 85554721 - 2³ = 85554713 is a prime.

It is a super-2 number, since 2×85554721² = 14639220570775682, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85554731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54676 + ... + 56218.

Almost surely, 2^85554721 is an apocalyptic number.

It is an amenable number.

85554721 is a deficient number, since it is larger than the sum of its proper divisors (13397151).

85554721 is an equidigital number, since it uses as much as digits as its factorization.

85554721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728 (or 1639 counting only the distinct ones).

The product of its digits is 56000, while the sum is 37.

The square root of 85554721 is about 9249.5795039558. The cubic root of 85554721 is about 440.6373700130.

The spelling of 85554721 in words is "eighty-five million, five hundred fifty-four thousand, seven hundred twenty-one".