47640220 has 48 divisors (see below), whose sum is σ = 105920640. Its totient is φ = 17948736.

The previous prime is 47640191. The next prime is 47640223. The reversal of 47640220 is 2204674.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47640223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107319 + ... + 107761.

It is an arithmetic number, because the mean of its divisors is an integer number (2206680).

Almost surely, 2^47640220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47640220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52960320).

47640220 is an abundant number, since it is smaller than the sum of its proper divisors (58280420).

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

47640220 is a wasteful number, since it uses less digits than its factorization.

47640220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 47640220 is about 6902.1895076852. The cubic root of 47640220 is about 362.5138353816.

Adding to 47640220 its reverse (2204674), we get a palindrome (49844894).

The spelling of 47640220 in words is "forty-seven million, six hundred forty thousand, two hundred twenty".