2643456420 has 72 divisors (see below), whose sum is σ = 8747444160. Its totient is φ = 640837440.

The previous prime is 2643456419. The next prime is 2643456443. The reversal of 2643456420 is 246543462.

2643456420 is a `hidden beast` number, since 2 + 6 + 4 + 3 + 4 + 5 + 642 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 665560 + ... + 669519.

It is an arithmetic number, because the mean of its divisors is an integer number (121492280).

Almost surely, 2^2643456420 is an apocalyptic number.

2643456420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2643456420 is an abundant number, since it is smaller than the sum of its proper divisors (6103987740).

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

2643456420 is a wasteful number, since it uses less digits than its factorization.

2643456420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335105 (or 1335100 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The square root of 2643456420 is about 51414.5545541338. The cubic root of 2643456420 is about 1382.6875477366.

Adding to 2643456420 its reverse (246543462), we get a palindrome (2889999882).

It can be divided in two parts, 2643456 and 420, that added together give a square (2643876 = 1626²).

The spelling of 2643456420 in words is "two billion, six hundred forty-three million, four hundred fifty-six thousand, four hundred twenty".