78645441 has 32 divisors (see below), whose sum is σ = 127641600. Its totient is φ = 42973392.

The previous prime is 78645433. The next prime is 78645443. The reversal of 78645441 is 14454687.

It is not a de Polignac number, because 78645441 - 2³ = 78645433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78645441.

It is not an unprimeable number, because it can be changed into a prime (78645443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22006 + ... + 25328.

It is an arithmetic number, because the mean of its divisors is an integer number (3988800).

Almost surely, 2^78645441 is an apocalyptic number.

It is an amenable number.

78645441 is a deficient number, since it is larger than the sum of its proper divisors (48996159).

78645441 is a wasteful number, since it uses less digits than its factorization.

78645441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370 (or 3356 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 78645441 is about 8868.2264856058. The cubic root of 78645441 is about 428.4411575648.

The spelling of 78645441 in words is "seventy-eight million, six hundred forty-five thousand, four hundred forty-one".