30780890 has 64 divisors (see below), whose sum is σ = 66873600. Its totient is φ = 9977856.

The previous prime is 30780889. The next prime is 30780901. The reversal of 30780890 is 9808703.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 30780890.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119642 + ... + 119898.

It is an arithmetic number, because the mean of its divisors is an integer number (1044900).

Almost surely, 2^30780890 is an apocalyptic number.

30780890 is an abundant number, since it is smaller than the sum of its proper divisors (36092710).

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

30780890 is a wasteful number, since it uses less digits than its factorization.

30780890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 30780890 is about 5548.0528115727. The cubic root of 30780890 is about 313.3961985929.

The spelling of 30780890 in words is "thirty million, seven hundred eighty thousand, eight hundred ninety".