646828272 has 120 divisors (see below), whose sum is σ = 1846500864. Its totient is φ = 211341312.

The previous prime is 646828261. The next prime is 646828283. The reversal of 646828272 is 272828646.

It is an interprime number because it is at equal distance from previous prime (646828261) and next prime (646828283).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2066388 + ... + 2066700.

Almost surely, 2^646828272 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 646828272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923250432).

646828272 is an abundant number, since it is smaller than the sum of its proper divisors (1199672592).

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

646828272 is a wasteful number, since it uses less digits than its factorization.

646828272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 558 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 646828272 is about 25432.8187977660. The cubic root of 646828272 is about 864.8278459452.

The spelling of 646828272 in words is "six hundred forty-six million, eight hundred twenty-eight thousand, two hundred seventy-two".