78340636624 has 10 divisors (see below), whose sum is σ = 151784983490. Its totient is φ = 39170318304.

The previous prime is 78340636601. The next prime is 78340636643. The reversal of 78340636624 is 42663604387.

It can be written as a sum of positive squares in only one way, i.e., 52135502224 + 26205134400 = 228332^2 + 161880^2 .

It is a super-2 number, since 2×78340636624² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2448144879 + ... + 2448144910.

It is an arithmetic number, because the mean of its divisors is an integer number (15178498349).

Almost surely, 2^78340636624 is an apocalyptic number.

It is an amenable number.

78340636624 is a deficient number, since it is larger than the sum of its proper divisors (73444346866).

78340636624 is a wasteful number, since it uses less digits than its factorization.

78340636624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896289797 (or 4896289791 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 49.

The spelling of 78340636624 in words is "seventy-eight billion, three hundred forty million, six hundred thirty-six thousand, six hundred twenty-four".