68401990 has 8 divisors (see below), whose sum is σ = 123123600. Its totient is φ = 27360792.

The previous prime is 68401987. The next prime is 68402029. The reversal of 68401990 is 9910486.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3420090 + ... + 3420109.

It is an arithmetic number, because the mean of its divisors is an integer number (15390450).

Almost surely, 2^68401990 is an apocalyptic number.

68401990 is a deficient number, since it is larger than the sum of its proper divisors (54721610).

68401990 is a wasteful number, since it uses less digits than its factorization.

68401990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840206.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 68401990 is about 8270.5495585239. The cubic root of 68401990 is about 408.9682366041.

The spelling of 68401990 in words is "sixty-eight million, four hundred one thousand, nine hundred ninety".