68778900 has 54 divisors (see below), whose sum is σ = 215586462. Its totient is φ = 18340800.

The previous prime is 68778881. The next prime is 68778929. The reversal of 68778900 is 987786.

It can be written as a sum of positive squares in 3 ways, for example, as 121104 + 68657796 = 348^2 + 8286^2 .

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

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 37311 + ... + 39110.

Almost surely, 2^68778900 is an apocalyptic number.

68778900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68778900 is an abundant number, since it is smaller than the sum of its proper divisors (146807562).

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

68778900 is a wasteful number, since it uses less digits than its factorization.

68778900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76441 (or 76431 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 68778900 is about 8293.3045283530. The cubic root of 68778900 is about 409.7180294037.

The spelling of 68778900 in words is "sixty-eight million, seven hundred seventy-eight thousand, nine hundred".