78457405 has 12 divisors (see below), whose sum is σ = 101949300. Its totient is φ = 57937152.

The previous prime is 78457399. The next prime is 78457447. The reversal of 78457405 is 50475487.

It can be written as a sum of positive squares in 6 ways, for example, as 22477081 + 55980324 = 4741^2 + 7482^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78457405 is a prime.

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45580 + ... + 47269.

It is an arithmetic number, because the mean of its divisors is an integer number (8495775).

Almost surely, 2^78457405 is an apocalyptic number.

It is an amenable number.

78457405 is a deficient number, since it is larger than the sum of its proper divisors (23491895).

78457405 is a wasteful number, since it uses less digits than its factorization.

78457405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92880 (or 92867 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 78457405 is about 8857.6184722531. The cubic root of 78457405 is about 428.0994269983.

The spelling of 78457405 in words is "seventy-eight million, four hundred fifty-seven thousand, four hundred five".