78394481 has 16 divisors (see below), whose sum is σ = 87272640. Its totient is φ = 69822720.

The previous prime is 78394457. The next prime is 78394487. The reversal of 78394481 is 18449387.

It is not a de Polignac number, because 78394481 - 2¹⁸ = 78132337 is a prime.

It is a super-2 number, since 2×78394481² = 12291389302518722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78394487) 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, 186890 + ... + 187308.

It is an arithmetic number, because the mean of its divisors is an integer number (5454540).

Almost surely, 2^78394481 is an apocalyptic number.

It is an amenable number.

78394481 is a deficient number, since it is larger than the sum of its proper divisors (8878159).

78394481 is a wasteful number, since it uses less digits than its factorization.

78394481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736.

The product of its digits is 193536, while the sum is 44.

The square root of 78394481 is about 8854.0657892293. The cubic root of 78394481 is about 427.9849490296.

The spelling of 78394481 in words is "seventy-eight million, three hundred ninety-four thousand, four hundred eighty-one".