30728631 has 8 divisors (see below), whose sum is σ = 41006704. Its totient is φ = 20468160.

The previous prime is 30728629. The next prime is 30728641. The reversal of 30728631 is 13682703.

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

It is not a de Polignac number, because 30728631 - 2¹ = 30728629 is a prime.

It is a super-2 number, since 2×30728631² = 1888497526268322, 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 (30728641) 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, 435 + ... + 7851.

It is an arithmetic number, because the mean of its divisors is an integer number (5125838).

Almost surely, 2^30728631 is an apocalyptic number.

30728631 is a deficient number, since it is larger than the sum of its proper divisors (10278073).

30728631 is a wasteful number, since it uses less digits than its factorization.

30728631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8801.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 30728631 is about 5543.3411405036. The cubic root of 30728631 is about 313.2187394694.

The spelling of 30728631 in words is "thirty million, seven hundred twenty-eight thousand, six hundred thirty-one".