47921640 has 192 divisors, whose sum is σ = 166017600. Its totient is φ = 11022336.

The previous prime is 47921611. The next prime is 47921647. The reversal of 47921640 is 4612974.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (47921647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 344691 + ... + 344829.

It is an arithmetic number, because the mean of its divisors is an integer number (864675).

Almost surely, 2^47921640 is an apocalyptic number.

47921640 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 47921640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83008800).

47921640 is an abundant number, since it is smaller than the sum of its proper divisors (118095960).

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

47921640 is a wasteful number, since it uses less digits than its factorization.

47921640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 47921640 is about 6922.5457744965. The cubic root of 47921640 is about 363.2262475613.

The spelling of 47921640 in words is "forty-seven million, nine hundred twenty-one thousand, six hundred forty".