72843656 has 8 divisors (see below), whose sum is σ = 136581870. Its totient is φ = 36421824.

The previous prime is 72843649. The next prime is 72843671. The reversal of 72843656 is 65634827.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 6421156 = 8150^2 + 2534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4552721 + ... + 4552736.

Almost surely, 2^72843656 is an apocalyptic number.

It is an amenable number.

72843656 is a deficient number, since it is larger than the sum of its proper divisors (63738214).

72843656 is a wasteful number, since it uses less digits than its factorization.

72843656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9105463 (or 9105459 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 72843656 is about 8534.8495007235. The cubic root of 72843656 is about 417.6353435488.

The spelling of 72843656 in words is "seventy-two million, eight hundred forty-three thousand, six hundred fifty-six".