47775644 has 48 divisors (see below), whose sum is σ = 104690880. Its totient is φ = 18600960.

The previous prime is 47775613. The next prime is 47775659. The reversal of 47775644 is 44657774.

It is a super-2 number, since 2×47775644² = 4565024319229472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 47775595 and 47775604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12074 + ... + 15534.

It is an arithmetic number, because the mean of its divisors is an integer number (2181060).

Almost surely, 2^47775644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47775644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52345440).

47775644 is an abundant number, since it is smaller than the sum of its proper divisors (56915236).

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

47775644 is a wasteful number, since it uses less digits than its factorization.

47775644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518 (or 3516 counting only the distinct ones).

The product of its digits is 658560, while the sum is 44.

The square root of 47775644 is about 6911.9927661999. The cubic root of 47775644 is about 362.8570092025.

The spelling of 47775644 in words is "forty-seven million, seven hundred seventy-five thousand, six hundred forty-four".