47781820 has 24 divisors (see below), whose sum is σ = 100964304. Its totient is φ = 18994176.

The previous prime is 47781817. The next prime is 47781829. The reversal of 47781820 is 2818774.

It is a super-3 number, since 3×47781820³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 47781820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47781829) 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, 4069 + ... + 10588.

It is an arithmetic number, because the mean of its divisors is an integer number (4206846).

Almost surely, 2^47781820 is an apocalyptic number.

It is an amenable number.

47781820 is an abundant number, since it is smaller than the sum of its proper divisors (53182484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47781820 is a wasteful number, since it uses less digits than its factorization.

47781820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14829 (or 14827 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 47781820 is about 6912.4395114894. The cubic root of 47781820 is about 362.8726441450.

The spelling of 47781820 in words is "forty-seven million, seven hundred eighty-one thousand, eight hundred twenty".