30720088 has 96 divisors (see below), whose sum is σ = 74057760. Its totient is φ = 11658240.

The previous prime is 30720083. The next prime is 30720089. The reversal of 30720088 is 88002703.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30720083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 503578 + ... + 503638.

It is an arithmetic number, because the mean of its divisors is an integer number (771435).

Almost surely, 2^30720088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30720088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37028880).

30720088 is an abundant number, since it is smaller than the sum of its proper divisors (43337672).

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

30720088 is a wasteful number, since it uses less digits than its factorization.

30720088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 30720088 is about 5542.5705227809. The cubic root of 30720088 is about 313.1897103456.

The spelling of 30720088 in words is "thirty million, seven hundred twenty thousand, eighty-eight".