31428873 has 48 divisors (see below), whose sum is σ = 54221440. Its totient is φ = 17169408.

The previous prime is 31428857. The next prime is 31428893. The reversal of 31428873 is 37882413.

It is not a de Polignac number, because 31428873 - 2⁴ = 31428857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31428893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 226038 + ... + 226176.

Almost surely, 2^31428873 is an apocalyptic number.

It is an amenable number.

31428873 is a deficient number, since it is larger than the sum of its proper divisors (22792567).

31428873 is a wasteful number, since it uses less digits than its factorization.

31428873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 283 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 31428873 is about 5606.1460023799. The cubic root of 31428873 is about 315.5800950787.

It can be divided in two parts, 31428 and 873, that multiplied together give a square (27436644 = 5238²).

The spelling of 31428873 in words is "thirty-one million, four hundred twenty-eight thousand, eight hundred seventy-three".