731471220 has 72 divisors (see below), whose sum is σ = 2228868096. Its totient is φ = 194173632.

The previous prime is 731471171. The next prime is 731471233. The reversal of 731471220 is 22174137.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31029 + ... + 49251.

Almost surely, 2^731471220 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 731471220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114434048).

731471220 is an abundant number, since it is smaller than the sum of its proper divisors (1497396876).

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

731471220 is a wasteful number, since it uses less digits than its factorization.

731471220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18461 (or 18456 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 731471220 is about 27045.7246159167. The cubic root of 731471220 is about 901.0158159959.

The spelling of 731471220 in words is "seven hundred thirty-one million, four hundred seventy-one thousand, two hundred twenty".