30726820 has 24 divisors (see below), whose sum is σ = 68322744. Its totient is φ = 11567616.

The previous prime is 30726809. The next prime is 30726821. The reversal of 30726820 is 2862703.

It can be written as a sum of positive squares in 4 ways, for example, as 322624 + 30404196 = 568^2 + 5514^2 .

It is not an unprimeable number, because it can be changed into a prime (30726821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44847 + ... + 45526.

It is an arithmetic number, because the mean of its divisors is an integer number (2846781).

Almost surely, 2^30726820 is an apocalyptic number.

It is an amenable number.

30726820 is an abundant number, since it is smaller than the sum of its proper divisors (37595924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30726820 is a wasteful number, since it uses less digits than its factorization.

30726820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90399 (or 90397 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 30726820 is about 5543.1777889582. The cubic root of 30726820 is about 313.2125861388.

The spelling of 30726820 in words is "thirty million, seven hundred twenty-six thousand, eight hundred twenty".