78903124609 has 3 divisors (see below), whose sum is σ = 78903405507. Its totient is φ = 78902843712.

The previous prime is 78903124603. The next prime is 78903124621. The reversal of 78903124609 is 90642130987.

The square root of 78903124609 is 280897.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 63310108225 + 15593016384 = 251615^2 + 124872^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78903124609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78903124603) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 140449 + ... + 421345.

It is an arithmetic number, because the mean of its divisors is an integer number (26301135169).

Almost surely, 2^78903124609 is an apocalyptic number.

78903124609 is the 280897-th square number.

78903124609 is the 140449-th centered octagonal number.

It is an amenable number.

78903124609 is a deficient number, since it is larger than the sum of its proper divisors (280898).

78903124609 is an frugal number, since it uses more digits than its factorization.

78903124609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561794 (or 280897 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

Multiplying 78903124609 by its sum of digits (49), we get a square (3866253105841 = 1966279²).

The spelling of 78903124609 in words is "seventy-eight billion, nine hundred three million, one hundred twenty-four thousand, six hundred nine".