78206930 has 8 divisors (see below), whose sum is σ = 140772492. Its totient is φ = 31282768.

The previous prime is 78206903. The next prime is 78206951. The reversal of 78206930 is 3960287.

It can be written as a sum of positive squares in 2 ways, for example, as 78198649 + 8281 = 8843^2 + 91^2 .

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

It is a super-2 number, since 2×78206930² = 12232647800049800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3910337 + ... + 3910356.

Almost surely, 2^78206930 is an apocalyptic number.

78206930 is a deficient number, since it is larger than the sum of its proper divisors (62565562).

78206930 is a wasteful number, since it uses less digits than its factorization.

78206930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7820700.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 78206930 is about 8843.4682110584. The cubic root of 78206930 is about 427.6433726787.

The spelling of 78206930 in words is "seventy-eight million, two hundred six thousand, nine hundred thirty".