68543790 has 64 divisors (see below), whose sum is σ = 194088960. Its totient is φ = 15160320.

The previous prime is 68543777. The next prime is 68543801. The reversal of 68543790 is 9734586.

It is a happy number.

It is a super-2 number, since 2×68543790² = 9396502295128200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 31 ways as a sum of consecutive naturals, for example, 1246 + ... + 11774.

It is an arithmetic number, because the mean of its divisors is an integer number (3032640).

Almost surely, 2^68543790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68543790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97044480).

68543790 is an abundant number, since it is smaller than the sum of its proper divisors (125545170).

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

68543790 is a wasteful number, since it uses less digits than its factorization.

68543790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10577.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 68543790 is about 8279.1177066158. The cubic root of 68543790 is about 409.2506439289.

The spelling of 68543790 in words is "sixty-eight million, five hundred forty-three thousand, seven hundred ninety".