72155280 has 40 divisors (see below), whose sum is σ = 223682112. Its totient is φ = 19241344.

The previous prime is 72155263. The next prime is 72155287. The reversal of 72155280 is 8255127.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (72155287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150084 + ... + 150563.

Almost surely, 2^72155280 is an apocalyptic number.

It is an amenable number.

72155280 is an abundant number, since it is smaller than the sum of its proper divisors (151526832).

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

72155280 is a wasteful number, since it uses less digits than its factorization.

72155280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300663 (or 300657 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 72155280 is about 8494.4264079454. The cubic root of 72155280 is about 416.3156196993.

The spelling of 72155280 in words is "seventy-two million, one hundred fifty-five thousand, two hundred eighty".