30128780 has 24 divisors (see below), whose sum is σ = 69022800. Its totient is φ = 10955840.

The previous prime is 30128759. The next prime is 30128789. The reversal of 30128780 is 8782103.

It is not an unprimeable number, because it can be changed into a prime (30128789) 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, 68255 + ... + 68694.

It is an arithmetic number, because the mean of its divisors is an integer number (2875950).

Almost surely, 2^30128780 is an apocalyptic number.

It is an amenable number.

30128780 is an abundant number, since it is smaller than the sum of its proper divisors (38894020).

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

30128780 is a wasteful number, since it uses less digits than its factorization.

30128780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136969 (or 136967 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 30128780 is about 5488.9689377879. The cubic root of 30128780 is about 311.1672263669.

The spelling of 30128780 in words is "thirty million, one hundred twenty-eight thousand, seven hundred eighty".