28870400872 has 8 divisors (see below), whose sum is σ = 54132001650. Its totient is φ = 14435200432.

The previous prime is 28870400869. The next prime is 28870400873. The reversal of 28870400872 is 27800407882.

It can be written as a sum of positive squares in only one way, i.e., 23899304836 + 4971096036 = 154594^2 + 70506^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28870400873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1804400047 + ... + 1804400062.

Almost surely, 2^28870400872 is an apocalyptic number.

It is an amenable number.

28870400872 is a deficient number, since it is larger than the sum of its proper divisors (25261600778).

28870400872 is a wasteful number, since it uses less digits than its factorization.

28870400872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608800115 (or 3608800111 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 46.

The spelling of 28870400872 in words is "twenty-eight billion, eight hundred seventy million, four hundred thousand, eight hundred seventy-two".