72909847 has 4 divisors (see below), whose sum is σ = 73008720. Its totient is φ = 72810976.

The previous prime is 72909817. The next prime is 72909853. The reversal of 72909847 is 74890927.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72909847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72909797 and 72909806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72909817) 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, 48322 + ... + 49807.

It is an arithmetic number, because the mean of its divisors is an integer number (18252180).

Almost surely, 2^72909847 is an apocalyptic number.

72909847 is a deficient number, since it is larger than the sum of its proper divisors (98873).

72909847 is an equidigital number, since it uses as much as digits as its factorization.

72909847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98872.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 72909847 is about 8538.7263101706. The cubic root of 72909847 is about 417.7618031188.

The spelling of 72909847 in words is "seventy-two million, nine hundred nine thousand, eight hundred forty-seven".