30807640 has 16 divisors (see below), whose sum is σ = 69317280. Its totient is φ = 12323040.

The previous prime is 30807613. The next prime is 30807661. The reversal of 30807640 is 4670803.

It is a super-2 number, since 2×30807640² = 1898221364739200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30807599 and 30807608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385056 + ... + 385135.

It is an arithmetic number, because the mean of its divisors is an integer number (4332330).

Almost surely, 2^30807640 is an apocalyptic number.

It is an amenable number.

30807640 is an abundant number, since it is smaller than the sum of its proper divisors (38509640).

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

30807640 is a wasteful number, since it uses less digits than its factorization.

30807640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770202 (or 770198 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 30807640 is about 5550.4630437469. The cubic root of 30807640 is about 313.4869575127.

The spelling of 30807640 in words is "thirty million, eight hundred seven thousand, six hundred forty".