28737385785 has 48 divisors (see below), whose sum is σ = 50693273280. Its totient is φ = 15055931520.

The previous prime is 28737385777. The next prime is 28737385799. The reversal of 28737385785 is 58758373782.

28737385785 is a `hidden beast` number, since 28 + 7 + 3 + 7 + 38 + 578 + 5 = 666.

It is not a de Polignac number, because 28737385785 - 2³ = 28737385777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2263786 + ... + 2276444.

It is an arithmetic number, because the mean of its divisors is an integer number (1056109860).

Almost surely, 2^28737385785 is an apocalyptic number.

It is an amenable number.

28737385785 is a deficient number, since it is larger than the sum of its proper divisors (21955887495).

28737385785 is a wasteful number, since it uses less digits than its factorization.

28737385785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13558 (or 13555 counting only the distinct ones).

The product of its digits is 79027200, while the sum is 63.

The spelling of 28737385785 in words is "twenty-eight billion, seven hundred thirty-seven million, three hundred eighty-five thousand, seven hundred eighty-five".