47856640 has 88 divisors (see below), whose sum is σ = 123802560. Its totient is φ = 17645568.

The previous prime is 47856617. The next prime is 47856647. The reversal of 47856640 is 4665874.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 47856593 and 47856602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47856647) 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, 66201 + ... + 66919.

Almost surely, 2^47856640 is an apocalyptic number.

47856640 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 47856640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61901280).

47856640 is an abundant number, since it is smaller than the sum of its proper divisors (75945920).

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

47856640 is a wasteful number, since it uses less digits than its factorization.

47856640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 47856640 is about 6917.8493767933. The cubic root of 47856640 is about 363.0619488664.

The spelling of 47856640 in words is "forty-seven million, eight hundred fifty-six thousand, six hundred forty".