68121240 has 64 divisors (see below), whose sum is σ = 222946560. Its totient is φ = 16513920.

The previous prime is 68121233. The next prime is 68121247. The reversal of 68121240 is 4212186.

It is an interprime number because it is at equal distance from previous prime (68121233) and next prime (68121247).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 68121240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68121247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24484 + ... + 27123.

It is an arithmetic number, because the mean of its divisors is an integer number (3483540).

Almost surely, 2^68121240 is an apocalyptic number.

68121240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68121240 is an abundant number, since it is smaller than the sum of its proper divisors (154825320).

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

68121240 is a wasteful number, since it uses less digits than its factorization.

68121240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51632 (or 51628 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 68121240 is about 8253.5592322343. The cubic root of 68121240 is about 408.4079445317.

The spelling of 68121240 in words is "sixty-eight million, one hundred twenty-one thousand, two hundred forty".