1428260638 has 16 divisors (see below), whose sum is σ = 2460880224. Its totient is φ = 609003360.

The previous prime is 1428260633. The next prime is 1428260699. The reversal of 1428260638 is 8360628241.

It is a self number, because there is not a number n which added to its sum of digits gives 1428260638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428260633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256173 + ... + 261688.

It is an arithmetic number, because the mean of its divisors is an integer number (153805014).

Almost surely, 2^1428260638 is an apocalyptic number.

1428260638 is a deficient number, since it is larger than the sum of its proper divisors (1032619586).

1428260638 is a wasteful number, since it uses less digits than its factorization.

1428260638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518067.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 1428260638 is about 37792.3357044785. The cubic root of 1428260638 is about 1126.1662015016.

Adding to 1428260638 its reverse (8360628241), we get a palindrome (9788888879).

The spelling of 1428260638 in words is "one billion, four hundred twenty-eight million, two hundred sixty thousand, six hundred thirty-eight".