28571868 has 36 divisors (see below), whose sum is σ = 77780248. Its totient is φ = 8791200.

The previous prime is 28571857. The next prime is 28571869. The reversal of 28571868 is 86817582.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30058 + ... + 30993.

Almost surely, 2^28571868 is an apocalyptic number.

It is an amenable number.

28571868 is an abundant number, since it is smaller than the sum of its proper divisors (49208380).

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

28571868 is a wasteful number, since it uses less digits than its factorization.

28571868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61074 (or 61069 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28571868 is about 5345.2659428694. The cubic root of 28571868 is about 305.7122760017.

It can be divided in two parts, 2 and 8571868, that added together give a triangular number (8571870 = T₄₁₄₀).

The spelling of 28571868 in words is "twenty-eight million, five hundred seventy-one thousand, eight hundred sixty-eight".