28988677658 has 4 divisors (see below), whose sum is σ = 43483016490. Its totient is φ = 14494338828.

The previous prime is 28988677643. The next prime is 28988677681. The reversal of 28988677658 is 85677688982.

It is a happy number.

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., 18540362569 + 10448315089 = 136163^2 + 102217^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7247169413 + ... + 7247169416.

Almost surely, 2^28988677658 is an apocalyptic number.

28988677658 is a deficient number, since it is larger than the sum of its proper divisors (14494338832).

28988677658 is a wasteful number, since it uses less digits than its factorization.

28988677658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14494338831.

The product of its digits is 650280960, while the sum is 74.

The spelling of 28988677658 in words is "twenty-eight billion, nine hundred eighty-eight million, six hundred seventy-seven thousand, six hundred fifty-eight".