30256840 has 16 divisors (see below), whose sum is σ = 68077980. Its totient is φ = 12102720.

The previous prime is 30256829. The next prime is 30256841. The reversal of 30256840 is 4865203.

It can be written as a sum of positive squares in 2 ways, for example, as 25140196 + 5116644 = 5014^2 + 2262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30256799 and 30256808.

It is not an unprimeable number, because it can be changed into a prime (30256841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378171 + ... + 378250.

Almost surely, 2^30256840 is an apocalyptic number.

It is an amenable number.

30256840 is an abundant number, since it is smaller than the sum of its proper divisors (37821140).

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

30256840 is a wasteful number, since it uses less digits than its factorization.

30256840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756432 (or 756428 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 30256840 is about 5500.6217830351. The cubic root of 30256840 is about 311.6074671258.

The spelling of 30256840 in words is "thirty million, two hundred fifty-six thousand, eight hundred forty".