123456778285 has 8 divisors (see below), whose sum is σ = 148223005920. Its totient is φ = 98715507984.

The previous prime is 123456778283. The next prime is 123456778303. The reversal of 123456778285 is 582877654321.

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

It is a cyclic number.

It is not a de Polignac number, because 123456778285 - 2¹ = 123456778283 is a prime.

It is a super-2 number, since 2×123456778285² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123456778283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6228447 + ... + 6248236.

It is an arithmetic number, because the mean of its divisors is an integer number (18527875740).

Almost surely, 2^123456778285 is an apocalyptic number.

It is an amenable number.

123456778285 is a deficient number, since it is larger than the sum of its proper divisors (24766227635).

123456778285 is a wasteful number, since it uses less digits than its factorization.

123456778285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12478667.

The product of its digits is 22579200, while the sum is 58.

The spelling of 123456778285 in words is "one hundred twenty-three billion, four hundred fifty-six million, seven hundred seventy-eight thousand, two hundred eighty-five".