30142756 has 24 divisors (see below), whose sum is σ = 60854976. Its totient is φ = 12796320.

The previous prime is 30142747. The next prime is 30142789. The reversal of 30142756 is 65724103.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

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, 2035 + ... + 8026.

It is an arithmetic number, because the mean of its divisors is an integer number (2535624).

Almost surely, 2^30142756 is an apocalyptic number.

It is an amenable number.

30142756 is an abundant number, since it is smaller than the sum of its proper divisors (30712220).

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

30142756 is a wasteful number, since it uses less digits than its factorization.

30142756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10179 (or 10177 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 30142756 is about 5490.2418890246. The cubic root of 30142756 is about 311.2153332034.

Adding to 30142756 its reverse (65724103), we get a palindrome (95866859).

The spelling of 30142756 in words is "thirty million, one hundred forty-two thousand, seven hundred fifty-six".