78380400538 has 16 divisors (see below), whose sum is σ = 128513843136. Its totient is φ = 35556619840.

The previous prime is 78380400533. The next prime is 78380400563. The reversal of 78380400538 is 83500408387.

It is a super-2 number, since 2×78380400538² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78380400533) 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, 3530431 + ... + 3552562.

It is an arithmetic number, because the mean of its divisors is an integer number (8032115196).

Almost surely, 2^78380400538 is an apocalyptic number.

78380400538 is a deficient number, since it is larger than the sum of its proper divisors (50133442598).

78380400538 is a wasteful number, since it uses less digits than its factorization.

78380400538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7083509.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 78380400538 in words is "seventy-eight billion, three hundred eighty million, four hundred thousand, five hundred thirty-eight".