78507813 has 8 divisors (see below), whose sum is σ = 106904448. Its totient is φ = 51224864.

The previous prime is 78507811. The next prime is 78507817. The reversal of 78507813 is 31870587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78507813 - 2¹ = 78507811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78507811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278256 + ... + 278537.

It is an arithmetic number, because the mean of its divisors is an integer number (13363056).

Almost surely, 2^78507813 is an apocalyptic number.

It is an amenable number.

78507813 is a deficient number, since it is larger than the sum of its proper divisors (28396635).

78507813 is a wasteful number, since it uses less digits than its factorization.

78507813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556843.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 78507813 is about 8860.4634754622. The cubic root of 78507813 is about 428.1910903919.

The spelling of 78507813 in words is "seventy-eight million, five hundred seven thousand, eight hundred thirteen".