30105640 has 32 divisors (see below), whose sum is σ = 71723880. Its totient is φ = 11333632.

The previous prime is 30105637. The next prime is 30105653. The reversal of 30105640 is 4650103.

It can be written as a sum of positive squares in 4 ways, for example, as 21141604 + 8964036 = 4598^2 + 2994^2 .

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, 21457 + ... + 22816.

Almost surely, 2^30105640 is an apocalyptic number.

It is an amenable number.

30105640 is an abundant number, since it is smaller than the sum of its proper divisors (41618240).

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

30105640 is a wasteful number, since it uses less digits than its factorization.

30105640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44301 (or 44297 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 30105640 is about 5486.8606689071. The cubic root of 30105640 is about 311.0875433772.

Adding to 30105640 its reverse (4650103), we get a palindrome (34755743).

The spelling of 30105640 in words is "thirty million, one hundred five thousand, six hundred forty".