1428304644 has 48 divisors (see below), whose sum is σ = 3987863040. Its totient is φ = 439477920.

The previous prime is 1428304643. The next prime is 1428304649. The reversal of 1428304644 is 4464038241.

1428304644 is a `hidden beast` number, since 1 + 4 + 2 + 8 + 3 + 0 + 4 + 644 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1428304599 and 1428304608.

It is not an unprimeable number, because it can be changed into a prime (1428304643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507252 + ... + 510059.

It is an arithmetic number, because the mean of its divisors is an integer number (83080480).

Almost surely, 2^1428304644 is an apocalyptic number.

It is an amenable number.

1428304644 is an abundant number, since it is smaller than the sum of its proper divisors (2559558396).

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

1428304644 is a wasteful number, since it uses less digits than its factorization.

1428304644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017337 (or 1017329 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

The square root of 1428304644 is about 37792.9179079891. The cubic root of 1428304644 is about 1126.1777674487.

The spelling of 1428304644 in words is "one billion, four hundred twenty-eight million, three hundred four thousand, six hundred forty-four".