30878428 has 18 divisors (see below), whose sum is σ = 62860056. Its totient is φ = 13233528.

The previous prime is 30878423. The next prime is 30878447. The reversal of 30878428 is 82487803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30878423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78576 + ... + 78967.

Almost surely, 2^30878428 is an apocalyptic number.

It is an amenable number.

30878428 is an abundant number, since it is smaller than the sum of its proper divisors (31981628).

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

30878428 is a wasteful number, since it uses less digits than its factorization.

30878428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157561 (or 157552 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 30878428 is about 5556.8361501847. The cubic root of 30878428 is about 313.7268778694.

The spelling of 30878428 in words is "thirty million, eight hundred seventy-eight thousand, four hundred twenty-eight".