30210640 has 20 divisors (see below), whose sum is σ = 70239924. Its totient is φ = 12084224.

The previous prime is 30210637. The next prime is 30210643. The reversal of 30210640 is 4601203.

It is an interprime number because it is at equal distance from previous prime (30210637) and next prime (30210643).

It can be written as a sum of positive squares in 2 ways, for example, as 11235904 + 18974736 = 3352^2 + 4356^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30210643) 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, 188737 + ... + 188896.

Almost surely, 2^30210640 is an apocalyptic number.

It is an amenable number.

30210640 is an abundant number, since it is smaller than the sum of its proper divisors (40029284).

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

30210640 is a wasteful number, since it uses less digits than its factorization.

30210640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377646 (or 377640 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 30210640 is about 5496.4206534799. The cubic root of 30210640 is about 311.4487856667.

Adding to 30210640 its reverse (4601203), we get a palindrome (34811843).

The spelling of 30210640 in words is "thirty million, two hundred ten thousand, six hundred forty".