78018449 has 8 divisors (see below), whose sum is σ = 81623808. Its totient is φ = 74494240.

The previous prime is 78018431. The next prime is 78018463. The reversal of 78018449 is 94481087.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78018449 - 2¹⁶ = 77952913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78018649) 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, 18317 + ... + 22170.

It is an arithmetic number, because the mean of its divisors is an integer number (10202976).

Almost surely, 2^78018449 is an apocalyptic number.

It is an amenable number.

78018449 is a deficient number, since it is larger than the sum of its proper divisors (3605359).

78018449 is a wasteful number, since it uses less digits than its factorization.

78018449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40575.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 78018449 is about 8832.8052735244. The cubic root of 78018449 is about 427.2995519587.

The spelling of 78018449 in words is "seventy-eight million, eighteen thousand, four hundred forty-nine".