30135720 has 64 divisors (see below), whose sum is σ = 93335040. Its totient is φ = 7776000.

The previous prime is 30135683. The next prime is 30135731. The reversal of 30135720 is 2753103.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331 + ... + 7770.

It is an arithmetic number, because the mean of its divisors is an integer number (1458360).

Almost surely, 2^30135720 is an apocalyptic number.

30135720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30135720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46667520).

30135720 is an abundant number, since it is smaller than the sum of its proper divisors (63199320).

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

30135720 is a wasteful number, since it uses less digits than its factorization.

30135720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8146 (or 8142 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 30135720 is about 5489.6010784027. The cubic root of 30135720 is about 311.1911164233.

Adding to 30135720 its reverse (2753103), we get a palindrome (32888823).

The spelling of 30135720 in words is "thirty million, one hundred thirty-five thousand, seven hundred twenty".