31028069 has 12 divisors (see below), whose sum is σ = 32279436. Its totient is φ = 29820672.

The previous prime is 31028059. The next prime is 31028071. The reversal of 31028069 is 96082013.

It can be written as a sum of positive squares in 2 ways, for example, as 21967969 + 9060100 = 4687^2 + 3010^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31028069 is a prime.

It is a super-2 number, since 2×31028069² = 1925482131737522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31028059) 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, 179267 + ... + 179439.

It is an arithmetic number, because the mean of its divisors is an integer number (2689953).

Almost surely, 2^31028069 is an apocalyptic number.

It is an amenable number.

31028069 is a deficient number, since it is larger than the sum of its proper divisors (1251367).

31028069 is an equidigital number, since it uses as much as digits as its factorization.

31028069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 31028069 is about 5570.2844631132. The cubic root of 31028069 is about 314.2328489102.

The spelling of 31028069 in words is "thirty-one million, twenty-eight thousand, sixty-nine".