68719440 has 80 divisors (see below), whose sum is σ = 225574848. Its totient is φ = 17246208.

The previous prime is 68719439. The next prime is 68719459. The reversal of 68719440 is 4491786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×68719440² = 9444722867827200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4342 + ... + 12501.

Almost surely, 2^68719440 is an apocalyptic number.

68719440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68719440 is an abundant number, since it is smaller than the sum of its proper divisors (156855408).

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

68719440 is a wasteful number, since it uses less digits than its factorization.

68719440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16876 (or 16870 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 68719440 is about 8289.7189337154. The cubic root of 68719440 is about 409.5999270121.

The spelling of 68719440 in words is "sixty-eight million, seven hundred nineteen thousand, four hundred forty".