28287163642 has 4 divisors (see below), whose sum is σ = 42430745466. Its totient is φ = 14143581820.

The previous prime is 28287163633. The next prime is 28287163693. The reversal of 28287163642 is 24636178282.

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., 27129054681 + 1158108961 = 164709^2 + 34031^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7071790909 + ... + 7071790912.

Almost surely, 2^28287163642 is an apocalyptic number.

28287163642 is a deficient number, since it is larger than the sum of its proper divisors (14143581824).

28287163642 is a wasteful number, since it uses less digits than its factorization.

28287163642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14143581823.

The product of its digits is 1548288, while the sum is 49.

The spelling of 28287163642 in words is "twenty-eight billion, two hundred eighty-seven million, one hundred sixty-three thousand, six hundred forty-two".