47640636 has 72 divisors (see below), whose sum is σ = 130376064. Its totient is φ = 15182640.

The previous prime is 47640631. The next prime is 47640641. The reversal of 47640636 is 63604674.

47640636 is a `hidden beast` number, since 4 + 7 + 640 + 6 + 3 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (47640631) and next prime (47640641).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 47640636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47640631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21291 + ... + 23421.

Almost surely, 2^47640636 is an apocalyptic number.

47640636 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47640636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65188032).

47640636 is an abundant number, since it is smaller than the sum of its proper divisors (82735428).

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

47640636 is a wasteful number, since it uses less digits than its factorization.

47640636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173 (or 2159 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 47640636 is about 6902.2196429844. The cubic root of 47640636 is about 362.5148905496.

The spelling of 47640636 in words is "forty-seven million, six hundred forty thousand, six hundred thirty-six".