47908890 has 96 divisors (see below), whose sum is σ = 133385616. Its totient is φ = 11888640.

The previous prime is 47908849. The next prime is 47908891. The reversal of 47908890 is 9880974.

It can be written as a sum of positive squares in 8 ways, for example, as 22838841 + 25070049 = 4779^2 + 5007^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47908891) 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 47 ways as a sum of consecutive naturals, for example, 264600 + ... + 264780.

Almost surely, 2^47908890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47908890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66692808).

47908890 is an abundant number, since it is smaller than the sum of its proper divisors (85476726).

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

47908890 is a wasteful number, since it uses less digits than its factorization.

47908890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 47908890 is about 6921.6248092482. The cubic root of 47908890 is about 363.1940314586.

The spelling of 47908890 in words is "forty-seven million, nine hundred eight thousand, eight hundred ninety".