30778530 has 32 divisors (see below), whose sum is σ = 75124800. Its totient is φ = 8068032.

The previous prime is 30778523. The next prime is 30778591. The reversal of 30778530 is 3587703.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30778491 and 30778500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6925 + ... + 10464.

It is an arithmetic number, because the mean of its divisors is an integer number (2347650).

Almost surely, 2^30778530 is an apocalyptic number.

30778530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30778530 is an abundant number, since it is smaller than the sum of its proper divisors (44346270).

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

30778530 is a wasteful number, since it uses less digits than its factorization.

30778530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17458.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 30778530 is about 5547.8401202630. The cubic root of 30778530 is about 313.3881889271.

The spelling of 30778530 in words is "thirty million, seven hundred seventy-eight thousand, five hundred thirty".