78575578 has 8 divisors (see below), whose sum is σ = 117903168. Its totient is φ = 39274524.

The previous prime is 78575573. The next prime is 78575579. The reversal of 78575578 is 87557587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (78575573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4525 + ... + 13327.

It is an arithmetic number, because the mean of its divisors is an integer number (14737896).

Almost surely, 2^78575578 is an apocalyptic number.

78575578 is a deficient number, since it is larger than the sum of its proper divisors (39327590).

78575578 is a wasteful number, since it uses less digits than its factorization.

78575578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13268.

The product of its digits is 2744000, while the sum is 52.

The square root of 78575578 is about 8864.2866605272. The cubic root of 78575578 is about 428.3142544590.

Subtracting 78575578 from its reverse (87557587), we obtain a square (8982009 = 2997²).

The spelling of 78575578 in words is "seventy-eight million, five hundred seventy-five thousand, five hundred seventy-eight".