78189030 has 32 divisors (see below), whose sum is σ = 208504800. Its totient is φ = 20850336.

The previous prime is 78189019. The next prime is 78189031. The reversal of 78189030 is 3098187.

It is a super-2 number, since 2×78189030² = 12227048824681800, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78189031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144525 + ... + 145064.

It is an arithmetic number, because the mean of its divisors is an integer number (6515775).

Almost surely, 2^78189030 is an apocalyptic number.

78189030 is an abundant number, since it is smaller than the sum of its proper divisors (130315770).

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

78189030 is a wasteful number, since it uses less digits than its factorization.

78189030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289605 (or 289599 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 78189030 is about 8842.4561067613. The cubic root of 78189030 is about 427.6107438547.

The spelling of 78189030 in words is "seventy-eight million, one hundred eighty-nine thousand, thirty".