78309630644 has 24 divisors (see below), whose sum is σ = 156626420160. Its totient is φ = 33559736256.

The previous prime is 78309630617. The next prime is 78309630647. The reversal of 78309630644 is 44603690387.

It is a super-2 number, since 2×78309630644² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78309630592 and 78309630601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78309630647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734624 + ... + 834440.

It is an arithmetic number, because the mean of its divisors is an integer number (6526100840).

Almost surely, 2^78309630644 is an apocalyptic number.

It is an amenable number.

78309630644 is an abundant number, since it is smaller than the sum of its proper divisors (78316789516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78309630644 is a wasteful number, since it uses less digits than its factorization.

78309630644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127847 (or 127845 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 78309630644 in words is "seventy-eight billion, three hundred nine million, six hundred thirty thousand, six hundred forty-four".