72106557 has 8 divisors (see below), whose sum is σ = 99457440. Its totient is φ = 46413360.

The previous prime is 72106549. The next prime is 72106579. The reversal of 72106557 is 75560127.

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

It is not a de Polignac number, because 72106557 - 2³ = 72106549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72106547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414319 + ... + 414492.

It is an arithmetic number, because the mean of its divisors is an integer number (12432180).

Almost surely, 2^72106557 is an apocalyptic number.

It is an amenable number.

72106557 is a deficient number, since it is larger than the sum of its proper divisors (27350883).

72106557 is a wasteful number, since it uses less digits than its factorization.

72106557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828843.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 72106557 is about 8491.5579842571. The cubic root of 72106557 is about 416.2218926092.

The spelling of 72106557 in words is "seventy-two million, one hundred six thousand, five hundred fifty-seven".