646646448 has 40 divisors (see below), whose sum is σ = 1909147648. Its totient is φ = 184756032.

The previous prime is 646646423. The next prime is 646646467. The reversal of 646646448 is 844646646.

It is a super-2 number, since 2×646646448² = 836303257422033408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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

It is a junction number, because it is equal to n+sod(n) for n = 646646397 and 646646406.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961936 + ... + 962607.

Almost surely, 2^646646448 is an apocalyptic number.

It is an amenable number.

646646448 is an abundant number, since it is smaller than the sum of its proper divisors (1262501200).

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

646646448 is a wasteful number, since it uses less digits than its factorization.

646646448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924561 (or 1924555 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 48.

The square root of 646646448 is about 25429.2439525834. The cubic root of 646646448 is about 864.7468037266.

The spelling of 646646448 in words is "six hundred forty-six million, six hundred forty-six thousand, four hundred forty-eight".