68040840 has 64 divisors (see below), whose sum is σ = 233285760. Its totient is φ = 15552000.

The previous prime is 68040839. The next prime is 68040859. The reversal of 68040840 is 4804086.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 68040798 and 68040807.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39661 + ... + 41340.

It is an arithmetic number, because the mean of its divisors is an integer number (3645090).

Almost surely, 2^68040840 is an apocalyptic number.

68040840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68040840 is an abundant number, since it is smaller than the sum of its proper divisors (165244920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68040840 is a wasteful number, since it uses less digits than its factorization.

68040840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81022 (or 81018 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 68040840 is about 8248.6871682711. The cubic root of 68040840 is about 408.2472069730.

It can be divided in two parts, 68040 and 840, that multiplied together give a square (57153600 = 7560²).

The spelling of 68040840 in words is "sixty-eight million, forty thousand, eight hundred forty".