78285859946 has 16 divisors (see below), whose sum is σ = 134212028544. Its totient is φ = 33549158544.

The previous prime is 78285859921. The next prime is 78285859969. The reversal of 78285859946 is 64995858287.

It is a super-2 number, since 2×78285859946² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78285859946.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107936 + ... + 410148.

It is an arithmetic number, because the mean of its divisors is an integer number (8388251784).

Almost surely, 2^78285859946 is an apocalyptic number.

78285859946 is a deficient number, since it is larger than the sum of its proper divisors (55926168598).

78285859946 is a wasteful number, since it uses less digits than its factorization.

78285859946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320725.

The product of its digits is 348364800, while the sum is 71.

The spelling of 78285859946 in words is "seventy-eight billion, two hundred eighty-five million, eight hundred fifty-nine thousand, nine hundred forty-six".