30780140 has 24 divisors (see below), whose sum is σ = 64752912. Its totient is φ = 12290240.

The previous prime is 30780109. The next prime is 30780143. The reversal of 30780140 is 4108703.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30780143) 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, 14975 + ... + 16905.

It is an arithmetic number, because the mean of its divisors is an integer number (2698038).

Almost surely, 2^30780140 is an apocalyptic number.

It is an amenable number.

30780140 is an abundant number, since it is smaller than the sum of its proper divisors (33972772).

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

30780140 is a wasteful number, since it uses less digits than its factorization.

30780140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737 (or 2735 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 30780140 is about 5547.9852198794. The cubic root of 30780140 is about 313.3936531927.

Adding to 30780140 its reverse (4108703), we get a palindrome (34888843).

The spelling of 30780140 in words is "thirty million, seven hundred eighty thousand, one hundred forty".