47661640 has 64 divisors (see below), whose sum is σ = 116444160. Its totient is φ = 17452800.

The previous prime is 47661631. The next prime is 47661643. The reversal of 47661640 is 4616674.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 47661596 and 47661605.

It is not an unprimeable number, because it can be changed into a prime (47661643) 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 15 ways as a sum of consecutive naturals, for example, 78217 + ... + 78823.

It is an arithmetic number, because the mean of its divisors is an integer number (1819440).

Almost surely, 2^47661640 is an apocalyptic number.

47661640 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 47661640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58222080).

47661640 is an abundant number, since it is smaller than the sum of its proper divisors (68782520).

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

47661640 is a wasteful number, since it uses less digits than its factorization.

47661640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 47661640 is about 6903.7410148412. The cubic root of 47661640 is about 362.5681584086.

The spelling of 47661640 in words is "forty-seven million, six hundred sixty-one thousand, six hundred forty".