28126249785 has 16 divisors (see below), whose sum is σ = 50002222080. Its totient is φ = 15000666480.

The previous prime is 28126249763. The next prime is 28126249787. The reversal of 28126249785 is 58794262182.

28126249785 is a `hidden beast` number, since 2 + 8 + 1 + 2 + 624 + 9 + 7 + 8 + 5 = 666.

It is not a de Polignac number, because 28126249785 - 2⁹ = 28126249273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28126249787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104171161 + ... + 104171430.

It is an arithmetic number, because the mean of its divisors is an integer number (3125138880).

Almost surely, 2^28126249785 is an apocalyptic number.

It is an amenable number.

28126249785 is a deficient number, since it is larger than the sum of its proper divisors (21875972295).

28126249785 is a wasteful number, since it uses less digits than its factorization.

28126249785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208342605 (or 208342599 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 28126249785 in words is "twenty-eight billion, one hundred twenty-six million, two hundred forty-nine thousand, seven hundred eighty-five".