28461377225 has 12 divisors (see below), whose sum is σ = 35818857744. Its totient is φ = 22429263120.

The previous prime is 28461377213. The next prime is 28461377227. The reversal of 28461377225 is 52277316482.

It is a de Polignac number, because none of the positive numbers 2^k-28461377225 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28461377225.

It is not an unprimeable number, because it can be changed into a prime (28461377227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8494259 + ... + 8497608.

It is an arithmetic number, because the mean of its divisors is an integer number (2984904812).

Almost surely, 2^28461377225 is an apocalyptic number.

28461377225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28461377225 is a deficient number, since it is larger than the sum of its proper divisors (7357480519).

28461377225 is a wasteful number, since it uses less digits than its factorization.

28461377225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16991944 (or 16991939 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 47.

The spelling of 28461377225 in words is "twenty-eight billion, four hundred sixty-one million, three hundred seventy-seven thousand, two hundred twenty-five".