28957851 has 64 divisors (see below), whose sum is σ = 51287040. Its totient is φ = 15966720.

The previous prime is 28957823. The next prime is 28957853. The reversal of 28957851 is 15875982.

It is a happy number.

28957851 is a `hidden beast` number, since 28 + 9 + 578 + 51 = 666.

It is not a de Polignac number, because 28957851 - 2⁹ = 28957339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28957797 and 28957806.

It is not an unprimeable number, because it can be changed into a prime (28957853) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 137136 + ... + 137346.

It is an arithmetic number, because the mean of its divisors is an integer number (801360).

Almost surely, 2^28957851 is an apocalyptic number.

28957851 is the 2691-st decagonal number.

28957851 is a deficient number, since it is larger than the sum of its proper divisors (22329189).

28957851 is a wasteful number, since it uses less digits than its factorization.

28957851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 267 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 28957851 is about 5381.2499477352. The cubic root of 28957851 is about 307.0827654775.

The spelling of 28957851 in words is "twenty-eight million, nine hundred fifty-seven thousand, eight hundred fifty-one".