72223258 has 4 divisors (see below), whose sum is σ = 108334890. Its totient is φ = 36111628.

The previous prime is 72223231. The next prime is 72223267. The reversal of 72223258 is 85232227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85232227 = 23 ⋅3705749.

It can be written as a sum of positive squares in only one way, i.e., 47651409 + 24571849 = 6903^2 + 4957^2 .

It is a super-2 number, since 2×72223258² = 10432397992269128, which contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18055813 + ... + 18055816.

Almost surely, 2^72223258 is an apocalyptic number.

72223258 is a deficient number, since it is larger than the sum of its proper divisors (36111632).

72223258 is a wasteful number, since it uses less digits than its factorization.

72223258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36111631.

The product of its digits is 13440, while the sum is 31.

The square root of 72223258 is about 8498.4267955899. The cubic root of 72223258 is about 416.4463166284.

The spelling of 72223258 in words is "seventy-two million, two hundred twenty-three thousand, two hundred fifty-eight".