1012345678 has 16 divisors (see below), whose sum is σ = 1597602384.
Its totient is φ = 480479040.
The previous prime is 1012345661. The next prime is 1012345693. The reversal of 1012345678 is 8765432101.
1012345678 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is a Harshad number since it is a multiple of its sum of digits (37).
It is an alternating number because its digits alternate between odd and even.
It is the 78-th primeval number, because it sets a new record (263414) in the number of distinct primes that is it possible to write using its digits.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163800 + ... + 169867.
It is an arithmetic number, because the mean of its divisors is an integer number (99850149).
Almost surely, 21012345678 is an apocalyptic number.
1012345678 is a deficient number, since it is larger than the sum of its proper divisors (585256706).
1012345678 is a wasteful number, since it uses less digits than its factorization.
1012345678 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 333747.
The product of its (nonzero) digits is 40320, while the sum is 37.
The square root of 1012345678 is about 31817.3801247054.
The cubic root of 1012345678 is about 1004.0984061204.
Adding to 1012345678 its reverse (8765432101), we get a palindrome (9777777779).
The spelling of 1012345678 in words is "one billion, twelve million, three hundred forty-five thousand, six hundred seventy-eight".