28157976 has 128 divisors (see below), whose sum is σ = 97574400. Its totient is φ = 7309440.

The previous prime is 28157971. The next prime is 28157977. The reversal of 28157976 is 67975182.

28157976 is a `hidden beast` number, since 2 + 8 + 1 + 579 + 76 = 666.

It is a super-2 number, since 2×28157976² = 1585743224833152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15786 + ... + 17478.

It is an arithmetic number, because the mean of its divisors is an integer number (762300).

Almost surely, 2^28157976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28157976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48787200).

28157976 is an abundant number, since it is smaller than the sum of its proper divisors (69416424).

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

28157976 is a wasteful number, since it uses less digits than its factorization.

28157976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726 (or 1716 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 28157976 is about 5306.4089552163. The cubic root of 28157976 is about 304.2289076941.

The spelling of 28157976 in words is "twenty-eight million, one hundred fifty-seven thousand, nine hundred seventy-six".