47981990 has 64 divisors (see below), whose sum is σ = 106386048. Its totient is φ = 15206400.

The previous prime is 47981981. The next prime is 47982001. The reversal of 47981990 is 9918974.

47981990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72260 + ... + 72920.

It is an arithmetic number, because the mean of its divisors is an integer number (1662282).

Almost surely, 2^47981990 is an apocalyptic number.

47981990 is an abundant number, since it is smaller than the sum of its proper divisors (58404058).

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

47981990 is a wasteful number, since it uses less digits than its factorization.

47981990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 47981990 is about 6926.9033485389. The cubic root of 47981990 is about 363.3786596278.

The spelling of 47981990 in words is "forty-seven million, nine hundred eighty-one thousand, nine hundred ninety".