68420287 has 8 divisors (see below), whose sum is σ = 73772496. Its totient is φ = 63080832.

The previous prime is 68420279. The next prime is 68420293. The reversal of 68420287 is 78202486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68420287 - 2³ = 68420279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68420227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10008 + ... + 15394.

It is an arithmetic number, because the mean of its divisors is an integer number (9221562).

Almost surely, 2^68420287 is an apocalyptic number.

68420287 is a deficient number, since it is larger than the sum of its proper divisors (5352209).

68420287 is a wasteful number, since it uses less digits than its factorization.

68420287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6377.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 68420287 is about 8271.6556383834. The cubic root of 68420287 is about 409.0046986267.

The spelling of 68420287 in words is "sixty-eight million, four hundred twenty thousand, two hundred eighty-seven".