31428033 has 64 divisors (see below), whose sum is σ = 55695360. Its totient is φ = 15303168.

The previous prime is 31428031. The next prime is 31428037. The reversal of 31428033 is 33082413.

It is not a de Polignac number, because 31428033 - 2¹ = 31428031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31427994 and 31428012.

It is not an unprimeable number, because it can be changed into a prime (31428031) 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, 378610 + ... + 378692.

It is an arithmetic number, because the mean of its divisors is an integer number (870240).

Almost surely, 2^31428033 is an apocalyptic number.

31428033 is the 3237-th octagonal number.

It is an amenable number.

31428033 is a deficient number, since it is larger than the sum of its proper divisors (24267327).

31428033 is a wasteful number, since it uses less digits than its factorization.

31428033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 31428033 is about 5606.0710841016. The cubic root of 31428033 is about 315.5772835489.

It can be divided in two parts, 3142 and 8033, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 31428033 in words is "thirty-one million, four hundred twenty-eight thousand, thirty-three".