78488578 has 32 divisors (see below), whose sum is σ = 138741120. Its totient is φ = 32607360.

The previous prime is 78488569. The next prime is 78488593. The reversal of 78488578 is 87588487.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61713 + ... + 62971.

It is an arithmetic number, because the mean of its divisors is an integer number (4335660).

Almost surely, 2^78488578 is an apocalyptic number.

78488578 is a deficient number, since it is larger than the sum of its proper divisors (60252542).

78488578 is a wasteful number, since it uses less digits than its factorization.

78488578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402.

The product of its digits is 4014080, while the sum is 55.

The square root of 78488578 is about 8859.3779691353. The cubic root of 78488578 is about 428.1561175315.

Subtracting 78488578 from its reverse (87588487), we obtain a palindrome (9099909).

The spelling of 78488578 in words is "seventy-eight million, four hundred eighty-eight thousand, five hundred seventy-eight".