72221594 has 4 divisors (see below), whose sum is σ = 108332394. Its totient is φ = 36110796.

The previous prime is 72221561. The next prime is 72221647. The reversal of 72221594 is 49512227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49512227 = 3467 ⋅14281.

It can be written as a sum of positive squares in only one way, i.e., 65529025 + 6692569 = 8095^2 + 2587^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72221594.

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 as a sum of consecutive naturals, namely, 18055397 + ... + 18055400.

Almost surely, 2^72221594 is an apocalyptic number.

72221594 is a deficient number, since it is larger than the sum of its proper divisors (36110800).

72221594 is a wasteful number, since it uses less digits than its factorization.

72221594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36110799.

The product of its digits is 10080, while the sum is 32.

The square root of 72221594 is about 8498.3288945533. The cubic root of 72221594 is about 416.4431183420.

The spelling of 72221594 in words is "seventy-two million, two hundred twenty-one thousand, five hundred ninety-four".