78189441 has 16 divisors (see below), whose sum is σ = 114229440. Its totient is φ = 47179520.

The previous prime is 78189431. The next prime is 78189457. The reversal of 78189441 is 14498187.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78189441 is a prime.

It is a super-2 number, since 2×78189441² = 12227177367784962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78189393 and 78189402.

It is not an unprimeable number, because it can be changed into a prime (78189401) 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, 2605 + ... + 12773.

It is an arithmetic number, because the mean of its divisors is an integer number (7139340).

Almost surely, 2^78189441 is an apocalyptic number.

It is an amenable number.

78189441 is a deficient number, since it is larger than the sum of its proper divisors (36039999).

78189441 is a wasteful number, since it uses less digits than its factorization.

78189441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10416.

The product of its digits is 64512, while the sum is 42.

The square root of 78189441 is about 8842.4793468800. The cubic root of 78189441 is about 427.6114930976.

The spelling of 78189441 in words is "seventy-eight million, one hundred eighty-nine thousand, four hundred forty-one".