68949090 has 96 divisors (see below), whose sum is σ = 211236480. Its totient is φ = 15677280.

The previous prime is 68949077. The next prime is 68949107. The reversal of 68949090 is 9094986.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 360895 + ... + 361085.

It is an arithmetic number, because the mean of its divisors is an integer number (2200380).

Almost surely, 2^68949090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68949090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105618240).

68949090 is an abundant number, since it is smaller than the sum of its proper divisors (142287390).

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

68949090 is a wasteful number, since it uses less digits than its factorization.

68949090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 68949090 is about 8303.5588755665. The cubic root of 68949090 is about 410.0556934060.

The spelling of 68949090 in words is "sixty-eight million, nine hundred forty-nine thousand, ninety".