78624001 has 4 divisors (see below), whose sum is σ = 80749012. Its totient is φ = 76498992.

The previous prime is 78623999. The next prime is 78624023. The reversal of 78624001 is 10042687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63600625 + 15023376 = 7975^2 + 3876^2 .

It is a cyclic number.

It is not a de Polignac number, because 78624001 - 2¹ = 78623999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78624061) 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, 1062450 + ... + 1062523.

It is an arithmetic number, because the mean of its divisors is an integer number (20187253).

Almost surely, 2^78624001 is an apocalyptic number.

It is an amenable number.

78624001 is a deficient number, since it is larger than the sum of its proper divisors (2125011).

78624001 is a wasteful number, since it uses less digits than its factorization.

78624001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125010.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 78624001 is about 8867.0175933061. The cubic root of 78624001 is about 428.4022207315.

Adding to 78624001 its reverse (10042687), we get a palindrome (88666688).

The spelling of 78624001 in words is "seventy-eight million, six hundred twenty-four thousand, one".