72645158 has 4 divisors (see below), whose sum is σ = 108967740. Its totient is φ = 36322578.

The previous prime is 72645091. The next prime is 72645187. The reversal of 72645158 is 85154627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85154627 = 419 ⋅203233.

It is a Curzon number.

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, 18161288 + ... + 18161291.

It is an arithmetic number, because the mean of its divisors is an integer number (27241935).

Almost surely, 2^72645158 is an apocalyptic number.

72645158 is a deficient number, since it is larger than the sum of its proper divisors (36322582).

72645158 is a wasteful number, since it uses less digits than its factorization.

72645158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36322581.

The product of its digits is 67200, while the sum is 38.

The square root of 72645158 is about 8523.2128918618. The cubic root of 72645158 is about 417.2556481873.

The spelling of 72645158 in words is "seventy-two million, six hundred forty-five thousand, one hundred fifty-eight".