30720156 has 24 divisors (see below), whose sum is σ = 75897360. Its totient is φ = 9637632.

The previous prime is 30720143. The next prime is 30720161. The reversal of 30720156 is 65102703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75091 + ... + 75498.

It is an arithmetic number, because the mean of its divisors is an integer number (3162390).

Almost surely, 2^30720156 is an apocalyptic number.

It is an amenable number.

30720156 is an abundant number, since it is smaller than the sum of its proper divisors (45177204).

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

30720156 is a wasteful number, since it uses less digits than its factorization.

30720156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150613 (or 150611 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 30720156 is about 5542.5766571154. The cubic root of 30720156 is about 313.1899414309.

Adding to 30720156 its reverse (65102703), we get a palindrome (95822859).

It can be divided in two parts, 30720 and 156, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 30720156 in words is "thirty million, seven hundred twenty thousand, one hundred fifty-six".