72906646 has 8 divisors (see below), whose sum is σ = 109396224. Its totient is φ = 36441240.

The previous prime is 72906611. The next prime is 72906649. The reversal of 72906646 is 64660927.

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

It is a junction number, because it is equal to n+sod(n) for n = 72906599 and 72906608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72906649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8491 + ... + 14761.

It is an arithmetic number, because the mean of its divisors is an integer number (13674528).

Almost surely, 2^72906646 is an apocalyptic number.

72906646 is a deficient number, since it is larger than the sum of its proper divisors (36489578).

72906646 is a wasteful number, since it uses less digits than its factorization.

72906646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12086.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 72906646 is about 8538.5388679797. The cubic root of 72906646 is about 417.7556892894.

The spelling of 72906646 in words is "seventy-two million, nine hundred six thousand, six hundred forty-six".