78456601 has 4 divisors (see below), whose sum is σ = 78475392. Its totient is φ = 78437812.

The previous prime is 78456577. The next prime is 78456619. The reversal of 78456601 is 10665487.

78456601 is a nontrivial binomial coefficient, being equal to C(12527, 2).

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 78456601 - 2⁹ = 78456089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78456641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 12526.

It is an arithmetic number, because the mean of its divisors is an integer number (19618848).

Almost surely, 2^78456601 is an apocalyptic number.

78456601 is the 12526-th triangular number.

78456601 is the 4176-th centered nonagonal number.

It is an amenable number.

78456601 is a deficient number, since it is larger than the sum of its proper divisors (18791).

78456601 is a wasteful number, since it uses less digits than its factorization.

78456601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18790.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 78456601 is about 8857.5730874772. The cubic root of 78456601 is about 428.0979646629.

The spelling of 78456601 in words is "seventy-eight million, four hundred fifty-six thousand, six hundred one".