72847655 has 4 divisors (see below), whose sum is σ = 87417192. Its totient is φ = 58278120.

The previous prime is 72847651. The next prime is 72847667. The reversal of 72847655 is 55674827.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72847655 - 2² = 72847651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72847651) 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 3 ways as a sum of consecutive naturals, for example, 7284761 + ... + 7284770.

It is an arithmetic number, because the mean of its divisors is an integer number (21854298).

Almost surely, 2^72847655 is an apocalyptic number.

72847655 is a deficient number, since it is larger than the sum of its proper divisors (14569537).

72847655 is a wasteful number, since it uses less digits than its factorization.

72847655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14569536.

The product of its digits is 470400, while the sum is 44.

The square root of 72847655 is about 8535.0837722895. The cubic root of 72847655 is about 417.6429859127.

The spelling of 72847655 in words is "seventy-two million, eight hundred forty-seven thousand, six hundred fifty-five".