78230786 has 4 divisors (see below), whose sum is σ = 117346182. Its totient is φ = 39115392.

The previous prime is 78230743. The next prime is 78230807. The reversal of 78230786 is 68703287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41203561 + 37027225 = 6419^2 + 6085^2 .

It is a super-2 number, since 2×78230786² = 12240111756355592, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19557695 + ... + 19557698.

Almost surely, 2^78230786 is an apocalyptic number.

78230786 is a deficient number, since it is larger than the sum of its proper divisors (39115396).

78230786 is a wasteful number, since it uses less digits than its factorization.

78230786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39115395.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 78230786 is about 8844.8169003095. The cubic root of 78230786 is about 427.6868505954.

The spelling of 78230786 in words is "seventy-eight million, two hundred thirty thousand, seven hundred eighty-six".