68191780 has 24 divisors (see below), whose sum is σ = 149429952. Its totient is φ = 26090592.

The previous prime is 68191763. The next prime is 68191793. The reversal of 68191780 is 8719186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73662 + ... + 74581.

It is an arithmetic number, because the mean of its divisors is an integer number (6226248).

Almost surely, 2^68191780 is an apocalyptic number.

It is an amenable number.

68191780 is an abundant number, since it is smaller than the sum of its proper divisors (81238172).

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

68191780 is a wasteful number, since it uses less digits than its factorization.

68191780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148275 (or 148273 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 68191780 is about 8257.8314344627. The cubic root of 68191780 is about 408.5488656214.

The spelling of 68191780 in words is "sixty-eight million, one hundred ninety-one thousand, seven hundred eighty".