646471476 has 96 divisors (see below), whose sum is σ = 1944212480. Its totient is φ = 181935072.

The previous prime is 646471471. The next prime is 646471493. The reversal of 646471476 is 674174646.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646471471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44271 + ... + 57033.

Almost surely, 2^646471476 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 646471476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972106240).

646471476 is an abundant number, since it is smaller than the sum of its proper divisors (1297741004).

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

646471476 is a wasteful number, since it uses less digits than its factorization.

646471476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12850 (or 12842 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 646471476 is about 25425.8033501402. The cubic root of 646471476 is about 864.6688012224.

The spelling of 646471476 in words is "six hundred forty-six million, four hundred seventy-one thousand, four hundred seventy-six".