30723280 has 80 divisors (see below), whose sum is σ = 82744704. Its totient is φ = 10391040.

The previous prime is 30723271. The next prime is 30723313. The reversal of 30723280 is 8232703.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent 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, 46150 + ... + 46810.

Almost surely, 2^30723280 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 30723280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41372352).

30723280 is an abundant number, since it is smaller than the sum of its proper divisors (52021424).

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

30723280 is a wasteful number, since it uses less digits than its factorization.

30723280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 30723280 is about 5542.8584683356. The cubic root of 30723280 is about 313.2005573950.

Adding to 30723280 its reverse (8232703), we get a palindrome (38955983).

The spelling of 30723280 in words is "thirty million, seven hundred twenty-three thousand, two hundred eighty".