78705513 has 24 divisors (see below), whose sum is σ = 118704768. Its totient is φ = 52110864.

The previous prime is 78705491. The next prime is 78705533. The reversal of 78705513 is 31550787.

78705513 is a `hidden beast` number, since 78 + 70 + 5 + 513 = 666.

It is not a de Polignac number, because 78705513 - 2¹⁰ = 78704489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78705533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37120 + ... + 39182.

It is an arithmetic number, because the mean of its divisors is an integer number (4946032).

Almost surely, 2^78705513 is an apocalyptic number.

It is an amenable number.

78705513 is a deficient number, since it is larger than the sum of its proper divisors (39999255).

78705513 is a wasteful number, since it uses less digits than its factorization.

78705513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235 (or 2223 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 78705513 is about 8871.6127620631. The cubic root of 78705513 is about 428.5502156643.

The spelling of 78705513 in words is "seventy-eight million, seven hundred five thousand, five hundred thirteen".