31328733 has 8 divisors (see below), whose sum is σ = 41800000. Its totient is φ = 20871648.

The previous prime is 31328723. The next prime is 31328761. The reversal of 31328733 is 33782313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31328733 - 2²¹ = 29231581 is a prime.

It is a super-2 number, since 2×31328733² = 1962979022770578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31328733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31328723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3768 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (5225000).

Almost surely, 2^31328733 is an apocalyptic number.

It is an amenable number.

31328733 is a deficient number, since it is larger than the sum of its proper divisors (10471267).

31328733 is a wasteful number, since it uses less digits than its factorization.

31328733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7091.

The product of its digits is 9072, while the sum is 30.

The square root of 31328733 is about 5597.2076073699. The cubic root of 31328733 is about 315.2445669341.

The spelling of 31328733 in words is "thirty-one million, three hundred twenty-eight thousand, seven hundred thirty-three".