78378615386 has 16 divisors (see below), whose sum is σ = 120526358400. Its totient is φ = 38204605920.

The previous prime is 78378615383. The next prime is 78378615437. The reversal of 78378615386 is 68351687387.

It is a super-2 number, since 2×78378615386² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78378615383) 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, 251336 + ... + 468963.

It is an arithmetic number, because the mean of its divisors is an integer number (7532897400).

Almost surely, 2^78378615386 is an apocalyptic number.

78378615386 is a deficient number, since it is larger than the sum of its proper divisors (42147743014).

78378615386 is a wasteful number, since it uses less digits than its factorization.

78378615386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721669.

The product of its digits is 40642560, while the sum is 62.

The spelling of 78378615386 in words is "seventy-eight billion, three hundred seventy-eight million, six hundred fifteen thousand, three hundred eighty-six".