72194640 has 160 divisors (see below), whose sum is σ = 261292800. Its totient is φ = 16482816.

The previous prime is 72194627. The next prime is 72194663. The reversal of 72194640 is 4649127.

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 (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81882 + ... + 82758.

It is an arithmetic number, because the mean of its divisors is an integer number (1633080).

Almost surely, 2^72194640 is an apocalyptic number.

72194640 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 72194640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130646400).

72194640 is an abundant number, since it is smaller than the sum of its proper divisors (189098160).

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

72194640 is a wasteful number, since it uses less digits than its factorization.

72194640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914 (or 894 counting only the distinct ones).

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

The square root of 72194640 is about 8496.7429053726. The cubic root of 72194640 is about 416.3913046397.

The spelling of 72194640 in words is "seventy-two million, one hundred ninety-four thousand, six hundred forty".