28297390642 has 4 divisors (see below), whose sum is σ = 42446085966. Its totient is φ = 14148695320.

The previous prime is 28297390633. The next prime is 28297390661. The reversal of 28297390642 is 24609379282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14954599521 + 13342791121 = 122289^2 + 115511^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28297390642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7074347659 + ... + 7074347662.

Almost surely, 2^28297390642 is an apocalyptic number.

28297390642 is a deficient number, since it is larger than the sum of its proper divisors (14148695324).

28297390642 is a wasteful number, since it uses less digits than its factorization.

28297390642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14148695323.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 28297390642 in words is "twenty-eight billion, two hundred ninety-seven million, three hundred ninety thousand, six hundred forty-two".