646474556 has 96 divisors (see below), whose sum is σ = 1442208768. Its totient is φ = 246758400.

The previous prime is 646474553. The next prime is 646474559. The reversal of 646474556 is 655474646.

It is an interprime number because it is at equal distance from previous prime (646474553) and next prime (646474559).

It is a self number, because there is not a number n which added to its sum of digits gives 646474556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646474553) 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, 1611956 + ... + 1612356.

It is an arithmetic number, because the mean of its divisors is an integer number (15023008).

Almost surely, 2^646474556 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 646474556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721104384).

646474556 is an abundant number, since it is smaller than the sum of its proper divisors (795734212).

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

646474556 is a wasteful number, since it uses less digits than its factorization.

646474556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 569 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 47.

The square root of 646474556 is about 25425.8639184591. The cubic root of 646474556 is about 864.6701744079.

The spelling of 646474556 in words is "six hundred forty-six million, four hundred seventy-four thousand, five hundred fifty-six".