47217408 has 72 divisors (see below), whose sum is σ = 143635968. Its totient is φ = 13489152.

The previous prime is 47217377. The next prime is 47217427. The reversal of 47217408 is 80471274.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 985 + ... + 9767.

It is an arithmetic number, because the mean of its divisors is an integer number (1994944).

Almost surely, 2^47217408 is an apocalyptic number.

47217408 is a gapful number since it is divisible by the number (48) 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 47217408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71817984).

47217408 is an abundant number, since it is smaller than the sum of its proper divisors (96418560).

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

47217408 is an equidigital number, since it uses as much as digits as its factorization.

47217408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8809 (or 8795 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 47217408 is about 6871.4924143158. The cubic root of 47217408 is about 361.4381973780.

The spelling of 47217408 in words is "forty-seven million, two hundred seventeen thousand, four hundred eight".