28157648706 has 64 divisors (see below), whose sum is σ = 68515113600. Its totient is φ = 8500852800.

The previous prime is 28157648699. The next prime is 28157648713. The reversal of 28157648706 is 60784675182.

28157648706 is a `hidden beast` number, since 2 + 8 + 157 + 6 + 487 + 0 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (28157648699) and next prime (28157648713).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71676 + ... + 247896.

It is an arithmetic number, because the mean of its divisors is an integer number (1070548650).

Almost surely, 2^28157648706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28157648706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34257556800).

28157648706 is an abundant number, since it is smaller than the sum of its proper divisors (40357464894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28157648706 is a wasteful number, since it uses less digits than its factorization.

28157648706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176512 (or 176506 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 28157648706 in words is "twenty-eight billion, one hundred fifty-seven million, six hundred forty-eight thousand, seven hundred six".