28781650472 has 8 divisors (see below), whose sum is σ = 53965594650. Its totient is φ = 14390825232.

The previous prime is 28781650441. The next prime is 28781650483. The reversal of 28781650472 is 27405618782.

It can be written as a sum of positive squares in only one way, i.e., 26142362596 + 2639287876 = 161686^2 + 51374^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28781650472.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1798853147 + ... + 1798853162.

Almost surely, 2^28781650472 is an apocalyptic number.

It is an amenable number.

28781650472 is a deficient number, since it is larger than the sum of its proper divisors (25183944178).

28781650472 is a wasteful number, since it uses less digits than its factorization.

28781650472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597706315 (or 3597706311 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 50.

The spelling of 28781650472 in words is "twenty-eight billion, seven hundred eighty-one million, six hundred fifty thousand, four hundred seventy-two".