28131268036 has 6 divisors (see below), whose sum is σ = 49229719070. Its totient is φ = 14065634016.

The previous prime is 28131268001. The next prime is 28131268043. The reversal of 28131268036 is 63086213182.

It can be written as a sum of positive squares in only one way, i.e., 24506023936 + 3625244100 = 156544^2 + 60210^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28131268036.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3516408501 + ... + 3516408508.

Almost surely, 2^28131268036 is an apocalyptic number.

It is an amenable number.

28131268036 is a deficient number, since it is larger than the sum of its proper divisors (21098451034).

28131268036 is a wasteful number, since it uses less digits than its factorization.

28131268036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032817013 (or 7032817011 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 28131268036 in words is "twenty-eight billion, one hundred thirty-one million, two hundred sixty-eight thousand, thirty-six".