31428105 has 16 divisors (see below), whose sum is σ = 50454144. Its totient is φ = 16705280.

The previous prime is 31428091. The next prime is 31428107. The reversal of 31428105 is 50182413.

It is not a de Polignac number, because 31428105 - 2⁵ = 31428073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31428107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1297 + ... + 8033.

It is an arithmetic number, because the mean of its divisors is an integer number (3153384).

Almost surely, 2^31428105 is an apocalyptic number.

It is an amenable number.

31428105 is a deficient number, since it is larger than the sum of its proper divisors (19026039).

31428105 is a wasteful number, since it uses less digits than its factorization.

31428105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 31428105 is about 5606.0775057075. The cubic root of 31428105 is about 315.5775245391.

The spelling of 31428105 in words is "thirty-one million, four hundred twenty-eight thousand, one hundred five".