78287912 has 8 divisors (see below), whose sum is σ = 146789850. Its totient is φ = 39143952.

The previous prime is 78287887. The next prime is 78287933. The reversal of 78287912 is 21978287.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 1094116 = 8786^2 + 1046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78287912² = 12257994330639488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4892987 + ... + 4893002.

Almost surely, 2^78287912 is an apocalyptic number.

It is an amenable number.

78287912 is a deficient number, since it is larger than the sum of its proper divisors (68501938).

78287912 is a wasteful number, since it uses less digits than its factorization.

78287912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9785995 (or 9785991 counting only the distinct ones).

The product of its digits is 112896, while the sum is 44.

The square root of 78287912 is about 8848.0456599184. The cubic root of 78287912 is about 427.7909276718.

The spelling of 78287912 in words is "seventy-eight million, two hundred eighty-seven thousand, nine hundred twelve".