28381707 has 12 divisors (see below), whose sum is σ = 41403024. Its totient is φ = 18733200.

The previous prime is 28381693. The next prime is 28381711. The reversal of 28381707 is 70718382.

It is not a de Polignac number, because 28381707 - 2¹⁵ = 28348939 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381757) 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, 14703 + ... + 16520.

It is an arithmetic number, because the mean of its divisors is an integer number (3450252).

Almost surely, 2^28381707 is an apocalyptic number.

28381707 is a deficient number, since it is larger than the sum of its proper divisors (13021317).

28381707 is a wasteful number, since it uses less digits than its factorization.

28381707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31330 (or 31327 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28381707 is about 5327.4484511819. The cubic root of 28381707 is about 305.0325397514.

The spelling of 28381707 in words is "twenty-eight million, three hundred eighty-one thousand, seven hundred seven".