30643040 has 24 divisors (see below), whose sum is σ = 72394560. Its totient is φ = 12257152.

The previous prime is 30643037. The next prime is 30643057. The reversal of 30643040 is 4034603.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95600 + ... + 95919.

It is an arithmetic number, because the mean of its divisors is an integer number (3016440).

Almost surely, 2^30643040 is an apocalyptic number.

It is an amenable number.

30643040 is an abundant number, since it is smaller than the sum of its proper divisors (41751520).

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

30643040 is a wasteful number, since it uses less digits than its factorization.

30643040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191534 (or 191526 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 30643040 is about 5535.6155935903. The cubic root of 30643040 is about 312.9276576815.

Adding to 30643040 its reverse (4034603), we get a palindrome (34677643).

The spelling of 30643040 in words is "thirty million, six hundred forty-three thousand, forty".