8161620 has 24 divisors (see below), whose sum is σ = 22852704. Its totient is φ = 2176416.

The previous prime is 8161607. The next prime is 8161627. The reversal of 8161620 is 261618.

It is a super-2 number, since 2×8161620² = 133224082048800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67954 + ... + 68073.

It is an arithmetic number, because the mean of its divisors is an integer number (952196).

Almost surely, 2^8161620 is an apocalyptic number.

It is an amenable number.

8161620 is an abundant number, since it is smaller than the sum of its proper divisors (14691084).

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

8161620 is a wasteful number, since it uses less digits than its factorization.

8161620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136039 (or 136037 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 8161620 is about 2856.8549140620. The cubic root of 8161620 is about 201.3378639781.

It can be divided in two parts, 81 and 61620, that multiplied together give a triangular number (4991220 = T₃₁₅₉).

The spelling of 8161620 in words is "eight million, one hundred sixty-one thousand, six hundred twenty".