72171804 has 48 divisors (see below), whose sum is σ = 177968000. Its totient is φ = 22700736.

The previous prime is 72171773. The next prime is 72171829. The reversal of 72171804 is 40817127.

It is a super-2 number, since 2×72171804² = 10417538585228832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79119 + ... + 80025.

Almost surely, 2^72171804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72171804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88984000).

72171804 is an abundant number, since it is smaller than the sum of its proper divisors (105796196).

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

72171804 is a wasteful number, since it uses less digits than its factorization.

72171804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 72171804 is about 8495.3989900416. The cubic root of 72171804 is about 416.3473968806.

The spelling of 72171804 in words is "seventy-two million, one hundred seventy-one thousand, eight hundred four".