30720032 has 24 divisors (see below), whose sum is σ = 69120576. Its totient is φ = 13165632.

The previous prime is 30720031. The next prime is 30720049. The reversal of 30720032 is 23002703.

It is not an unprimeable number, because it can be changed into a prime (30720031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68348 + ... + 68795.

It is an arithmetic number, because the mean of its divisors is an integer number (2880024).

Almost surely, 2^30720032 is an apocalyptic number.

30720032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

30720032 is an abundant number, since it is smaller than the sum of its proper divisors (38400544).

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

30720032 is a wasteful number, since it uses less digits than its factorization.

30720032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137160 (or 137152 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 17.

The square root of 30720032 is about 5542.5654709710. The cubic root of 30720032 is about 313.1895200398.

Adding to 30720032 its reverse (23002703), we get a palindrome (53722735).

The spelling of 30720032 in words is "thirty million, seven hundred twenty thousand, thirty-two".