78380400539 has 24 divisors (see below), whose sum is σ = 93241027728. Its totient is φ = 65676018240.

The previous prime is 78380400533. The next prime is 78380400563. The reversal of 78380400539 is 93500408387.

It is not a de Polignac number, because 78380400539 - 2⁸ = 78380400283 is a prime.

It is a super-2 number, since 2×78380400539² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78380400493 and 78380400502.

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 23 ways as a sum of consecutive naturals, for example, 406769 + ... + 567645.

It is an arithmetic number, because the mean of its divisors is an integer number (3885042822).

Almost surely, 2^78380400539 is an apocalyptic number.

78380400539 is a deficient number, since it is larger than the sum of its proper divisors (14860627189).

78380400539 is a wasteful number, since it uses less digits than its factorization.

78380400539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161115 (or 161108 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 78380400539 in words is "seventy-eight billion, three hundred eighty million, four hundred thousand, five hundred thirty-nine".