47944545640 has 72 divisors (see below), whose sum is σ = 109382113890. Its totient is φ = 18913590784.

The previous prime is 47944545637. The next prime is 47944545643. The reversal of 47944545640 is 4654544974.

It is an interprime number because it is at equal distance from previous prime (47944545637) and next prime (47944545643).

It can be written as a sum of positive squares in 9 ways, for example, as 3870581796 + 44073963844 = 62214^2 + 209938^2 .

It is not an unprimeable number, because it can be changed into a prime (47944545643) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 123250566 + ... + 123250954.

Almost surely, 2^47944545640 is an apocalyptic number.

47944545640 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 47944545640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54691056945).

47944545640 is an abundant number, since it is smaller than the sum of its proper divisors (61437568250).

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

47944545640 is an frugal number, since it uses more digits than its factorization.

47944545640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 52.

The spelling of 47944545640 in words is "forty-seven billion, nine hundred forty-four million, five hundred forty-five thousand, six hundred forty".