30649988 has 12 divisors (see below), whose sum is σ = 53775372. Its totient is φ = 15285600.

The previous prime is 30649981. The next prime is 30650003. The reversal of 30649988 is 88994603.

It can be written as a sum of positive squares in 2 ways, for example, as 18939904 + 11710084 = 4352^2 + 3422^2 .

It is not an unprimeable number, because it can be changed into a prime (30649981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063 + ... + 11238.

It is an arithmetic number, because the mean of its divisors is an integer number (4481281).

Almost surely, 2^30649988 is an apocalyptic number.

It is an amenable number.

30649988 is a deficient number, since it is larger than the sum of its proper divisors (23125384).

30649988 is a wasteful number, since it uses less digits than its factorization.

30649988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19702 (or 19700 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 30649988 is about 5536.2431304992. The cubic root of 30649988 is about 312.9513069567.

The spelling of 30649988 in words is "thirty million, six hundred forty-nine thousand, nine hundred eighty-eight".