78551073 has 24 divisors (see below), whose sum is σ = 122834400. Its totient is φ = 49605048.

The previous prime is 78551051. The next prime is 78551087. The reversal of 78551073 is 37015587.

78551073 is a `hidden beast` number, since 78 + 5 + 510 + 73 = 666.

It is not a de Polignac number, because 78551073 - 2⁵ = 78551041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78551273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5718 + ... + 13776.

It is an arithmetic number, because the mean of its divisors is an integer number (5118100).

Almost surely, 2^78551073 is an apocalyptic number.

It is an amenable number.

78551073 is a deficient number, since it is larger than the sum of its proper divisors (44283327).

78551073 is a wasteful number, since it uses less digits than its factorization.

78551073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106 (or 8081 counting only the distinct ones).

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

The square root of 78551073 is about 8862.9043208194. The cubic root of 78551073 is about 428.2697243715.

The spelling of 78551073 in words is "seventy-eight million, five hundred fifty-one thousand, seventy-three".