72273280 has 32 divisors (see below), whose sum is σ = 172779840. Its totient is φ = 28909056.

The previous prime is 72273259. The next prime is 72273293. The reversal of 72273280 is 8237227.

It is a tau number, because it is divible by the number of its divisors (32).

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 3 ways as a sum of consecutive naturals, for example, 55824 + ... + 57103.

It is an arithmetic number, because the mean of its divisors is an integer number (5399370).

Almost surely, 2^72273280 is an apocalyptic number.

It is an amenable number.

72273280 is an abundant number, since it is smaller than the sum of its proper divisors (100506560).

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

72273280 is a wasteful number, since it uses less digits than its factorization.

72273280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112946 (or 112934 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 72273280 is about 8501.3693014714. The cubic root of 72273280 is about 416.5424383430.

The spelling of 72273280 in words is "seventy-two million, two hundred seventy-three thousand, two hundred eighty".