78309086 has 8 divisors (see below), whose sum is σ = 117545904. Its totient is φ = 39127120.

The previous prime is 78309083. The next prime is 78309103. The reversal of 78309086 is 68090387.

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

It is a super-2 number, since 2×78309086² = 12264625900310792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78309083) 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, 9935 + ... + 15978.

It is an arithmetic number, because the mean of its divisors is an integer number (14693238).

Almost surely, 2^78309086 is an apocalyptic number.

78309086 is a deficient number, since it is larger than the sum of its proper divisors (39236818).

78309086 is a wasteful number, since it uses less digits than its factorization.

78309086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27426.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 78309086 is about 8849.2421144412. The cubic root of 78309086 is about 427.8294914312.

The spelling of 78309086 in words is "seventy-eight million, three hundred nine thousand, eighty-six".