68243040 has 96 divisors (see below), whose sum is σ = 238865760. Its totient is φ = 18196992.

The previous prime is 68243027. The next prime is 68243053. The reversal of 68243040 is 4034286.

It is an interprime number because it is at equal distance from previous prime (68243027) and next prime (68243053).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×68243040² = 9314225016883200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 68242995 and 68243013.

It is a congruent number.

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, 3579 + ... + 12218.

It is an arithmetic number, because the mean of its divisors is an integer number (2488185).

Almost surely, 2^68243040 is an apocalyptic number.

68243040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68243040 is an abundant number, since it is smaller than the sum of its proper divisors (170622720).

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

68243040 is a wasteful number, since it uses less digits than its factorization.

68243040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15821 (or 15807 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 68243040 is about 8260.9345718266. The cubic root of 68243040 is about 408.6512091864.

The spelling of 68243040 in words is "sixty-eight million, two hundred forty-three thousand, forty".