47281428 has 48 divisors (see below), whose sum is σ = 123984000. Its totient is φ = 15580224.

The previous prime is 47281427. The next prime is 47281441. The reversal of 47281428 is 82418274.

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 = 47281392 and 47281401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47281427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7153 + ... + 12071.

It is an arithmetic number, because the mean of its divisors is an integer number (2583000).

Almost surely, 2^47281428 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 47281428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61992000).

47281428 is an abundant number, since it is smaller than the sum of its proper divisors (76702572).

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

47281428 is a wasteful number, since it uses less digits than its factorization.

47281428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021 (or 5013 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 47281428 is about 6876.1492130407. The cubic root of 47281428 is about 361.6014763070.

The spelling of 47281428 in words is "forty-seven million, two hundred eighty-one thousand, four hundred twenty-eight".