47184640 has 72 divisors (see below), whose sum is σ = 114202368. Its totient is φ = 18677760.

The previous prime is 47184637. The next prime is 47184649. The reversal of 47184640 is 4648174.

It is a junction number, because it is equal to n+sod(n) for n = 47184596 and 47184605.

It is not an unprimeable number, because it can be changed into a prime (47184649) 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, 244384 + ... + 244576.

It is an arithmetic number, because the mean of its divisors is an integer number (1586144).

Almost surely, 2^47184640 is an apocalyptic number.

47184640 is a gapful number since it is divisible by the number (40) 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 47184640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57101184).

47184640 is an abundant number, since it is smaller than the sum of its proper divisors (67017728).

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

47184640 is a wasteful number, since it uses less digits than its factorization.

47184640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 47184640 is about 6869.1076567484. The cubic root of 47184640 is about 361.3545675746.

The spelling of 47184640 in words is "forty-seven million, one hundred eighty-four thousand, six hundred forty".