47957781 has 8 divisors (see below), whose sum is σ = 64093120. Its totient is φ = 31897152.

The previous prime is 47957761. The next prime is 47957807. The reversal of 47957781 is 18775974.

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

It is not a de Polignac number, because 47957781 - 2⁹ = 47957269 is a prime.

It is a super-2 number, since 2×47957781² = 4599897516887922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 47957781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47957761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17161 + ... + 19758.

It is an arithmetic number, because the mean of its divisors is an integer number (8011640).

Almost surely, 2^47957781 is an apocalyptic number.

It is an amenable number.

47957781 is a deficient number, since it is larger than the sum of its proper divisors (16135339).

47957781 is a wasteful number, since it uses less digits than its factorization.

47957781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37355.

The product of its digits is 493920, while the sum is 48.

The square root of 47957781 is about 6925.1556661204. The cubic root of 47957781 is about 363.3175359029.

The spelling of 47957781 in words is "forty-seven million, nine hundred fifty-seven thousand, seven hundred eighty-one".