72169440 has 192 divisors, whose sum is σ = 265918464. Its totient is φ = 16109568.

The previous prime is 72169417. The next prime is 72169451. The reversal of 72169440 is 4496127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157692 + ... + 158148.

It is an arithmetic number, because the mean of its divisors is an integer number (1384992).

Almost surely, 2^72169440 is an apocalyptic number.

72169440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72169440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132959232).

72169440 is an abundant number, since it is smaller than the sum of its proper divisors (193749024).

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

72169440 is a wasteful number, since it uses less digits than its factorization.

72169440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 72169440 is about 8495.2598547661. The cubic root of 72169440 is about 416.3428509871.

The spelling of 72169440 in words is "seventy-two million, one hundred sixty-nine thousand, four hundred forty".