78731248621 has 16 divisors (see below), whose sum is σ = 81637196544. Its totient is φ = 75884238144.

The previous prime is 78731248579. The next prime is 78731248643. The reversal of 78731248621 is 12684213787.

It is a cyclic number.

It is not a de Polignac number, because 78731248621 - 2⁹ = 78731248109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78731228621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1273011 + ... + 1333423.

It is an arithmetic number, because the mean of its divisors is an integer number (5102324784).

Almost surely, 2^78731248621 is an apocalyptic number.

It is an amenable number.

78731248621 is a deficient number, since it is larger than the sum of its proper divisors (2905947923).

78731248621 is a wasteful number, since it uses less digits than its factorization.

78731248621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60900.

The product of its digits is 903168, while the sum is 49.

The spelling of 78731248621 in words is "seventy-eight billion, seven hundred thirty-one million, two hundred forty-eight thousand, six hundred twenty-one".