72158637 has 8 divisors (see below), whose sum is σ = 101275360. Its totient is φ = 45573840.

The previous prime is 72158627. The next prime is 72158657. The reversal of 72158637 is 73685127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72158637 - 2⁶ = 72158573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72158595 and 72158604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72158617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632914 + ... + 633027.

It is an arithmetic number, because the mean of its divisors is an integer number (12659420).

Almost surely, 2^72158637 is an apocalyptic number.

It is an amenable number.

72158637 is a deficient number, since it is larger than the sum of its proper divisors (29116723).

72158637 is a wasteful number, since it uses less digits than its factorization.

72158637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265963.

The product of its digits is 70560, while the sum is 39.

The square root of 72158637 is about 8494.6240058051. The cubic root of 72158637 is about 416.3220759137.

The spelling of 72158637 in words is "seventy-two million, one hundred fifty-eight thousand, six hundred thirty-seven".