47451820 has 72 divisors (see below), whose sum is σ = 109756080. Its totient is φ = 17222400.

The previous prime is 47451809. The next prime is 47451823. The reversal of 47451820 is 2815474.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47451823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 341311 + ... + 341449.

It is an arithmetic number, because the mean of its divisors is an integer number (1524390).

Almost surely, 2^47451820 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 47451820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54878040).

47451820 is an abundant number, since it is smaller than the sum of its proper divisors (62304260).

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

47451820 is a wasteful number, since it uses less digits than its factorization.

47451820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 47451820 is about 6888.5281446765. The cubic root of 47451820 is about 362.0353332828.

The spelling of 47451820 in words is "forty-seven million, four hundred fifty-one thousand, eight hundred twenty".