68306408 has 32 divisors (see below), whose sum is σ = 136044360. Its totient is φ = 32040960.

The previous prime is 68306393. The next prime is 68306411. The reversal of 68306408 is 80460386.

It can be written as a sum of positive squares in 4 ways, for example, as 46758244 + 21548164 = 6838^2 + 4642^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 56660 + ... + 57852.

Almost surely, 2^68306408 is an apocalyptic number.

68306408 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

68306408 is the 4772-nd octagonal number.

It is an amenable number.

68306408 is a deficient number, since it is larger than the sum of its proper divisors (67737952).

68306408 is a wasteful number, since it uses less digits than its factorization.

68306408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 68306408 is about 8264.7690832836. The cubic root of 68306408 is about 408.7776562632. Note that the first 3 decimals are identical.

The spelling of 68306408 in words is "sixty-eight million, three hundred six thousand, four hundred eight".