68778499 has 4 divisors (see below), whose sum is σ = 72398440. Its totient is φ = 65158560.

The previous prime is 68778473. The next prime is 68778509. The reversal of 68778499 is 99487786.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68778499 - 2¹⁵ = 68745731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68778439) 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 3 ways as a sum of consecutive naturals, for example, 1809942 + ... + 1809979.

It is an arithmetic number, because the mean of its divisors is an integer number (18099610).

Almost surely, 2^68778499 is an apocalyptic number.

68778499 is a deficient number, since it is larger than the sum of its proper divisors (3619941).

68778499 is a wasteful number, since it uses less digits than its factorization.

68778499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619940.

The product of its digits is 6096384, while the sum is 58.

The square root of 68778499 is about 8293.2803521888. The cubic root of 68778499 is about 409.7172331457.

It can be divided in two parts, 6877 and 8499, that added together give a square (15376 = 124²).

The spelling of 68778499 in words is "sixty-eight million, seven hundred seventy-eight thousand, four hundred ninety-nine".