47091780 has 120 divisors (see below), whose sum is σ = 151545240. Its totient is φ = 12234240.

The previous prime is 47091773. The next prime is 47091799. The reversal of 47091780 is 8719074.

It can be written as a sum of positive squares in 4 ways, for example, as 1285956 + 45805824 = 1134^2 + 6768^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 66066 + ... + 66774.

It is an arithmetic number, because the mean of its divisors is an integer number (1262877).

Almost surely, 2^47091780 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 47091780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75772620).

47091780 is an abundant number, since it is smaller than the sum of its proper divisors (104453460).

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

47091780 is a wasteful number, since it uses less digits than its factorization.

47091780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 47091780 is about 6862.3450802186. The cubic root of 47091780 is about 361.1173616976.

The spelling of 47091780 in words is "forty-seven million, ninety-one thousand, seven hundred eighty".