30724280 has 16 divisors (see below), whose sum is σ = 69129720. Its totient is φ = 12289696.

The previous prime is 30724277. The next prime is 30724289. The reversal of 30724280 is 8242703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30724289) 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, 384014 + ... + 384093.

Almost surely, 2^30724280 is an apocalyptic number.

It is an amenable number.

30724280 is an abundant number, since it is smaller than the sum of its proper divisors (38405440).

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

30724280 is a wasteful number, since it uses less digits than its factorization.

30724280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768118 (or 768114 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 30724280 is about 5542.9486737656. The cubic root of 30724280 is about 313.2039554388.

Adding to 30724280 its reverse (8242703), we get a palindrome (38966983).

The spelling of 30724280 in words is "thirty million, seven hundred twenty-four thousand, two hundred eighty".