30721002 has 16 divisors (see below), whose sum is σ = 66168480. Its totient is φ = 9452592.

The previous prime is 30721001. The next prime is 30721021. The reversal of 30721002 is 20012703.

It is not an unprimeable number, because it can be changed into a prime (30721001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196852 + ... + 197007.

It is an arithmetic number, because the mean of its divisors is an integer number (4135530).

Almost surely, 2^30721002 is an apocalyptic number.

30721002 is an abundant number, since it is smaller than the sum of its proper divisors (35447478).

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

30721002 is a wasteful number, since it uses less digits than its factorization.

30721002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393877.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 30721002 is about 5542.6529748849. The cubic root of 30721002 is about 313.1928163757.

Adding to 30721002 its reverse (20012703), we get a palindrome (50733705).

The spelling of 30721002 in words is "thirty million, seven hundred twenty-one thousand, two".