72273440 has 24 divisors (see below), whose sum is σ = 170746380. Its totient is φ = 28909312.

The previous prime is 72273403. The next prime is 72273457. The reversal of 72273440 is 4437227.

It can be written as a sum of positive squares in 2 ways, for example, as 68095504 + 4177936 = 8252^2 + 2044^2 .

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, 225695 + ... + 226014.

Almost surely, 2^72273440 is an apocalyptic number.

It is an amenable number.

72273440 is an abundant number, since it is smaller than the sum of its proper divisors (98472940).

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

72273440 is a wasteful number, since it uses less digits than its factorization.

72273440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451724 (or 451716 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 29.

The square root of 72273440 is about 8501.3787117149. The cubic root of 72273440 is about 416.5427457261.

The spelling of 72273440 in words is "seventy-two million, two hundred seventy-three thousand, four hundred forty".