47781812 has 24 divisors (see below), whose sum is σ = 90988296. Its totient is φ = 21823488.

The previous prime is 47781809. The next prime is 47781817. The reversal of 47781812 is 21818774.

It can be written as a sum of positive squares in 4 ways, for example, as 10278436 + 37503376 = 3206^2 + 6124^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47781817) 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, 308 + ... + 9780.

It is an arithmetic number, because the mean of its divisors is an integer number (3791179).

Almost surely, 2^47781812 is an apocalyptic number.

It is an amenable number.

47781812 is a deficient number, since it is larger than the sum of its proper divisors (43206484).

47781812 is a wasteful number, since it uses less digits than its factorization.

47781812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9587 (or 9585 counting only the distinct ones).

The product of its digits is 25088, while the sum is 38.

The square root of 47781812 is about 6912.4389328225. The cubic root of 47781812 is about 362.8726238933.

The spelling of 47781812 in words is "forty-seven million, seven hundred eighty-one thousand, eight hundred twelve".