30725816 has 32 divisors (see below), whose sum is σ = 63488880. Its totient is φ = 13824000.

The previous prime is 30725803. The next prime is 30725837. The reversal of 30725816 is 61852703.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7160 + ... + 10616.

Almost surely, 2^30725816 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 30725816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31744440).

30725816 is an abundant number, since it is smaller than the sum of its proper divisors (32763064).

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

30725816 is a wasteful number, since it uses less digits than its factorization.

30725816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3575 (or 3571 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 30725816 is about 5543.0872264470. The cubic root of 30725816 is about 313.2091746906.

It can be divided in two parts, 3072 and 5816, that added together give a palindrome (8888).

The spelling of 30725816 in words is "thirty million, seven hundred twenty-five thousand, eight hundred sixteen".