47758721 has 4 divisors (see below), whose sum is σ = 48774912. Its totient is φ = 46742532.

The previous prime is 47758687. The next prime is 47758747. The reversal of 47758721 is 12785774.

47758721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47758721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47758751) 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, 508025 + ... + 508118.

It is an arithmetic number, because the mean of its divisors is an integer number (12193728).

Almost surely, 2^47758721 is an apocalyptic number.

It is an amenable number.

47758721 is a deficient number, since it is larger than the sum of its proper divisors (1016191).

47758721 is a wasteful number, since it uses less digits than its factorization.

47758721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016190.

The product of its digits is 109760, while the sum is 41.

The square root of 47758721 is about 6910.7684811459. The cubic root of 47758721 is about 362.8141606306.

The spelling of 47758721 in words is "forty-seven million, seven hundred fifty-eight thousand, seven hundred twenty-one".