72203746 has 4 divisors (see below), whose sum is σ = 108305622. Its totient is φ = 36101872.

The previous prime is 72203741. The next prime is 72203749. The reversal of 72203746 is 64730227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64730227 = 151 ⋅428677.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 140625 = 8489^2 + 375^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (72203741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18050935 + ... + 18050938.

Almost surely, 2^72203746 is an apocalyptic number.

72203746 is a deficient number, since it is larger than the sum of its proper divisors (36101876).

72203746 is a wasteful number, since it uses less digits than its factorization.

72203746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36101875.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 72203746 is about 8497.2787408676. The cubic root of 72203746 is about 416.4088105552.

The spelling of 72203746 in words is "seventy-two million, two hundred three thousand, seven hundred forty-six".