78212782 has 8 divisors (see below), whose sum is σ = 118107000. Its totient is φ = 38843784.

The previous prime is 78212777. The next prime is 78212791. The reversal of 78212782 is 28721287.

It is a happy number.

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

It is a super-2 number, since 2×78212782² = 12234478536359048, which contains 22 as substring.

It is a congruent 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, 130932 + ... + 131527.

It is an arithmetic number, because the mean of its divisors is an integer number (14763375).

Almost surely, 2^78212782 is an apocalyptic number.

78212782 is a deficient number, since it is larger than the sum of its proper divisors (39894218).

78212782 is a wasteful number, since it uses less digits than its factorization.

78212782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262610.

The product of its digits is 25088, while the sum is 37.

The square root of 78212782 is about 8843.7990705352. The cubic root of 78212782 is about 427.6540388545.

The spelling of 78212782 in words is "seventy-eight million, two hundred twelve thousand, seven hundred eighty-two".