72281380 has 24 divisors (see below), whose sum is σ = 153623232. Its totient is φ = 28563552.

The previous prime is 72281371. The next prime is 72281413. The reversal of 72281380 is 8318227.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20112 + ... + 23431.

It is an arithmetic number, because the mean of its divisors is an integer number (6400968).

Almost surely, 2^72281380 is an apocalyptic number.

It is an amenable number.

72281380 is an abundant number, since it is smaller than the sum of its proper divisors (81341852).

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

72281380 is a wasteful number, since it uses less digits than its factorization.

72281380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43635 (or 43633 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 72281380 is about 8501.8456819681. The cubic root of 72281380 is about 416.5579990395.

The spelling of 72281380 in words is "seventy-two million, two hundred eighty-one thousand, three hundred eighty".