47809636 has 24 divisors (see below), whose sum is σ = 97845440. Its totient is φ = 20012832.

The previous prime is 47809631. The next prime is 47809673. The reversal of 47809636 is 63690874.

It is a happy number.

It is a super-2 number, since 2×47809636² = 4571522588904992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 47809592 and 47809601.

It is not an unprimeable number, because it can be changed into a prime (47809631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18651 + ... + 21058.

Almost surely, 2^47809636 is an apocalyptic number.

It is an amenable number.

47809636 is an abundant number, since it is smaller than the sum of its proper divisors (50035804).

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

47809636 is a wasteful number, since it uses less digits than its factorization.

47809636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39763 (or 39761 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 47809636 is about 6914.4512435912. The cubic root of 47809636 is about 362.9430454499.

The spelling of 47809636 in words is "forty-seven million, eight hundred nine thousand, six hundred thirty-six".