72943220 has 24 divisors (see below), whose sum is σ = 175064064. Its totient is φ = 25009056.

The previous prime is 72943187. The next prime is 72943231. The reversal of 72943220 is 2234927.

It is a happy number.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 260372 + ... + 260651.

It is an arithmetic number, because the mean of its divisors is an integer number (7294336).

Almost surely, 2^72943220 is an apocalyptic number.

72943220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

72943220 is an abundant number, since it is smaller than the sum of its proper divisors (102120844).

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

72943220 is a wasteful number, since it uses less digits than its factorization.

72943220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521039 (or 521037 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 72943220 is about 8540.6803007723. The cubic root of 72943220 is about 417.8255340529.

The spelling of 72943220 in words is "seventy-two million, nine hundred forty-three thousand, two hundred twenty".