47215728 has 120 divisors (see below), whose sum is σ = 155990016. Its totient is φ = 13046400.

The previous prime is 47215717. The next prime is 47215733. The reversal of 47215728 is 82751274.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 47215692 and 47215701.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 30493 + ... + 32003.

Almost surely, 2^47215728 is an apocalyptic number.

47215728 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 47215728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77995008).

47215728 is an abundant number, since it is smaller than the sum of its proper divisors (108774288).

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

47215728 is a wasteful number, since it uses less digits than its factorization.

47215728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563 (or 1554 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 47215728 is about 6871.3701690420. The cubic root of 47215728 is about 361.4339106584.

The spelling of 47215728 in words is "forty-seven million, two hundred fifteen thousand, seven hundred twenty-eight".