78638601 has 4 divisors (see below), whose sum is σ = 104851472. Its totient is φ = 52425732.

The previous prime is 78638569. The next prime is 78638611. The reversal of 78638601 is 10683687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78638601 - 2⁵ = 78638569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78638601.

It is not an unprimeable number, because it can be changed into a prime (78638611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13106431 + ... + 13106436.

It is an arithmetic number, because the mean of its divisors is an integer number (26212868).

Almost surely, 2^78638601 is an apocalyptic number.

It is an amenable number.

78638601 is a deficient number, since it is larger than the sum of its proper divisors (26212871).

78638601 is a wasteful number, since it uses less digits than its factorization.

78638601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26212870.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 78638601 is about 8867.8408307772. The cubic root of 78638601 is about 428.4287363215.

The spelling of 78638601 in words is "seventy-eight million, six hundred thirty-eight thousand, six hundred one".