30840428 has 6 divisors (see below), whose sum is σ = 53970756. Its totient is φ = 15420212.

The previous prime is 30840389. The next prime is 30840449. The reversal of 30840428 is 82404803.

It is a super-2 number, since 2×30840428² = 1902263998446368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30840428.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3855050 + ... + 3855057.

It is an arithmetic number, because the mean of its divisors is an integer number (8995126).

Almost surely, 2^30840428 is an apocalyptic number.

It is an amenable number.

30840428 is a deficient number, since it is larger than the sum of its proper divisors (23130328).

30840428 is a wasteful number, since it uses less digits than its factorization.

30840428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7710111 (or 7710109 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 30840428 is about 5553.4158857410. The cubic root of 30840428 is about 313.5981308675.

The spelling of 30840428 in words is "thirty million, eight hundred forty thousand, four hundred twenty-eight".