78405543 has 8 divisors (see below), whose sum is σ = 116156400. Its totient is φ = 52270344.

The previous prime is 78405527. The next prime is 78405599. The reversal of 78405543 is 34550487.

78405543 is a `hidden beast` number, since 78 + 40 + 5 + 543 = 666.

It is not a de Polignac number, because 78405543 - 2⁴ = 78405527 is a prime.

It is a super-2 number, since 2×78405543² = 12294858346249698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78405498 and 78405507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78405143) 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, 1451928 + ... + 1451981.

It is an arithmetic number, because the mean of its divisors is an integer number (14519550).

Almost surely, 2^78405543 is an apocalyptic number.

78405543 is a deficient number, since it is larger than the sum of its proper divisors (37750857).

78405543 is a wasteful number, since it uses less digits than its factorization.

78405543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903918 (or 2903912 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 78405543 is about 8854.6904519582. The cubic root of 78405543 is about 428.0050786220.

The spelling of 78405543 in words is "seventy-eight million, four hundred five thousand, five hundred forty-three".