28133651625 has 32 divisors (see below), whose sum is σ = 47956237056. Its totient is φ = 14638640000.

The previous prime is 28133651621. The next prime is 28133651641. The reversal of 28133651625 is 52615633182.

It is not a de Polignac number, because 28133651625 - 2² = 28133651621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28133651621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 899541 + ... + 930290.

It is an arithmetic number, because the mean of its divisors is an integer number (1498632408).

Almost surely, 2^28133651625 is an apocalyptic number.

28133651625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28133651625 is a deficient number, since it is larger than the sum of its proper divisors (19822585431).

28133651625 is a wasteful number, since it uses less digits than its factorization.

28133651625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829890 (or 1829880 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The spelling of 28133651625 in words is "twenty-eight billion, one hundred thirty-three million, six hundred fifty-one thousand, six hundred twenty-five".