28781771068 has 12 divisors (see below), whose sum is σ = 51992876992. Its totient is φ = 13926663360.

The previous prime is 28781771023. The next prime is 28781771071. The reversal of 28781771068 is 86017718782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116055405 + ... + 116055652.

Almost surely, 2^28781771068 is an apocalyptic number.

It is an amenable number.

28781771068 is a deficient number, since it is larger than the sum of its proper divisors (23211105924).

28781771068 is a wasteful number, since it uses less digits than its factorization.

28781771068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232111092 (or 232111090 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 55.

The spelling of 28781771068 in words is "twenty-eight billion, seven hundred eighty-one million, seven hundred seventy-one thousand, sixty-eight".