72189158 has 4 divisors (see below), whose sum is σ = 108283740. Its totient is φ = 36094578.

The previous prime is 72189121. The next prime is 72189193. The reversal of 72189158 is 85198127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85198127 = 7 ⋅12171161.

It is a super-2 number, since 2×72189158² = 10422549065497928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18047288 + ... + 18047291.

It is an arithmetic number, because the mean of its divisors is an integer number (27070935).

Almost surely, 2^72189158 is an apocalyptic number.

72189158 is a deficient number, since it is larger than the sum of its proper divisors (36094582).

72189158 is a wasteful number, since it uses less digits than its factorization.

72189158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36094581.

The product of its digits is 40320, while the sum is 41.

The square root of 72189158 is about 8496.4203050461. The cubic root of 72189158 is about 416.3807650072.

The spelling of 72189158 in words is "seventy-two million, one hundred eighty-nine thousand, one hundred fifty-eight".