78436578 has 64 divisors (see below), whose sum is σ = 180237312. Its totient is φ = 22524480.

The previous prime is 78436573. The next prime is 78436591. The reversal of 78436578 is 87563487.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (78436571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247276 + ... + 247592.

It is an arithmetic number, because the mean of its divisors is an integer number (2816208).

Almost surely, 2^78436578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78436578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90118656).

78436578 is an abundant number, since it is smaller than the sum of its proper divisors (101800734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78436578 is a wasteful number, since it uses less digits than its factorization.

78436578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519.

The product of its digits is 1128960, while the sum is 48.

The square root of 78436578 is about 8856.4427396105. The cubic root of 78436578 is about 428.0615431052.

The spelling of 78436578 in words is "seventy-eight million, four hundred thirty-six thousand, five hundred seventy-eight".