78313566 has 8 divisors (see below), whose sum is σ = 156627144. Its totient is φ = 26104520.

The previous prime is 78313561. The next prime is 78313589. The reversal of 78313566 is 66531387.

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

78313566 is an admirable number.

It is a super-2 number, since 2×78313566² = 12266029239272712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78313561) 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, 6526125 + ... + 6526136.

It is an arithmetic number, because the mean of its divisors is an integer number (19578393).

Almost surely, 2^78313566 is an apocalyptic number.

78313566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78313566 is a wasteful number, since it uses less digits than its factorization.

78313566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052266.

The product of its digits is 90720, while the sum is 39.

The square root of 78313566 is about 8849.4952398428. The cubic root of 78313566 is about 427.8376498697.

The spelling of 78313566 in words is "seventy-eight million, three hundred thirteen thousand, five hundred sixty-six".