68278905 has 24 divisors (see below), whose sum is σ = 122433480. Its totient is φ = 35159040.

The previous prime is 68278897. The next prime is 68278933. The reversal of 68278905 is 50987286.

It can be written as a sum of positive squares in 4 ways, for example, as 3250809 + 65028096 = 1803^2 + 8064^2 .

It is not a de Polignac number, because 68278905 - 2³ = 68278897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24856 + ... + 27465.

It is an arithmetic number, because the mean of its divisors is an integer number (5101395).

Almost surely, 2^68278905 is an apocalyptic number.

It is an amenable number.

68278905 is a deficient number, since it is larger than the sum of its proper divisors (54154575).

68278905 is a wasteful number, since it uses less digits than its factorization.

68278905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52361 (or 52358 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 68278905 is about 8263.1050459255. The cubic root of 68278905 is about 408.7227852711.

The spelling of 68278905 in words is "sixty-eight million, two hundred seventy-eight thousand, nine hundred five".