30000078 has 16 divisors (see below), whose sum is σ = 66666960. Its totient is φ = 10000008.

The previous prime is 30000071. The next prime is 30000079. The reversal of 30000078 is 87000003.

It is a Harshad number since it is a multiple of its sum of digits (18).

30000078 is a modest number, since divided by 78 gives 30 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 30000078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277725 + ... + 277832.

It is an arithmetic number, because the mean of its divisors is an integer number (4166685).

Almost surely, 2^30000078 is an apocalyptic number.

30000078 is an abundant number, since it is smaller than the sum of its proper divisors (36666882).

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

30000078 is a wasteful number, since it uses less digits than its factorization.

30000078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555568 (or 555562 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 30000078 is about 5477.2326954403. The cubic root of 30000078 is about 310.7235198886.

The spelling of 30000078 in words is "thirty million, seventy-eight", and thus it is an aban number and an uban number.