78632189 has 4 divisors (see below), whose sum is σ = 78759840. Its totient is φ = 78504540.

The previous prime is 78632179. The next prime is 78632201. The reversal of 78632189 is 98123687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98123687 = 2351 ⋅41737.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78632189 is a prime.

It is a super-2 number, since 2×78632189² = 12366042293863442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78632159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62897 + ... + 64134.

It is an arithmetic number, because the mean of its divisors is an integer number (19689960).

Almost surely, 2^78632189 is an apocalyptic number.

It is an amenable number.

78632189 is a deficient number, since it is larger than the sum of its proper divisors (127651).

78632189 is a wasteful number, since it uses less digits than its factorization.

78632189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127650.

The product of its digits is 145152, while the sum is 44.

The square root of 78632189 is about 8867.4792923356. The cubic root of 78632189 is about 428.4170916598.

The spelling of 78632189 in words is "seventy-eight million, six hundred thirty-two thousand, one hundred eighty-nine".