30756642 has 64 divisors (see below), whose sum is σ = 73592064. Its totient is φ = 8386560.

The previous prime is 30756613. The next prime is 30756643. The reversal of 30756642 is 24665703.

It is not an unprimeable number, because it can be changed into a prime (30756643) 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 31 ways as a sum of consecutive naturals, for example, 91098 + ... + 91434.

It is an arithmetic number, because the mean of its divisors is an integer number (1149876).

Almost surely, 2^30756642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30756642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36796032).

30756642 is an abundant number, since it is smaller than the sum of its proper divisors (42835422).

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

30756642 is a wasteful number, since it uses less digits than its factorization.

30756642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 30756642 is about 5545.8671098395. The cubic root of 30756642 is about 313.3138831546.

The spelling of 30756642 in words is "thirty million, seven hundred fifty-six thousand, six hundred forty-two".