78578523 has 6 divisors (see below), whose sum is σ = 113502324. Its totient is φ = 52385676.

The previous prime is 78578483. The next prime is 78578527. The reversal of 78578523 is 32587587.

78578523 is a `hidden beast` number, since 78 + 57 + 8 + 523 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-78578523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78578527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4365465 + ... + 4365482.

It is an arithmetic number, because the mean of its divisors is an integer number (18917054).

Almost surely, 2^78578523 is an apocalyptic number.

78578523 is a deficient number, since it is larger than the sum of its proper divisors (34923801).

78578523 is a wasteful number, since it uses less digits than its factorization.

78578523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8730953 (or 8730950 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 78578523 is about 8864.4527749884. The cubic root of 78578523 is about 428.3196054419.

The spelling of 78578523 in words is "seventy-eight million, five hundred seventy-eight thousand, five hundred twenty-three".