72291370 has 8 divisors (see below), whose sum is σ = 130124484. Its totient is φ = 28916544.

The previous prime is 72291367. The next prime is 72291391. The reversal of 72291370 is 7319227.

It can be written as a sum of positive squares in 2 ways, for example, as 67420521 + 4870849 = 8211^2 + 2207^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×72291370³ (a number of 25 digits) contains 333 as substring.

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, 3614559 + ... + 3614578.

Almost surely, 2^72291370 is an apocalyptic number.

72291370 is a deficient number, since it is larger than the sum of its proper divisors (57833114).

72291370 is a wasteful number, since it uses less digits than its factorization.

72291370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7229144.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 72291370 is about 8502.4331811547. The cubic root of 72291370 is about 416.5771889641.

The spelling of 72291370 in words is "seventy-two million, two hundred ninety-one thousand, three hundred seventy".