68775440 has 40 divisors (see below), whose sum is σ = 168322560. Its totient is φ = 26061696.

The previous prime is 68775439. The next prime is 68775463. The reversal of 68775440 is 4457786.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×68775440² = 9460122294387200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21104 + ... + 24143.

It is an arithmetic number, because the mean of its divisors is an integer number (4208064).

Almost surely, 2^68775440 is an apocalyptic number.

It is an amenable number.

68775440 is an abundant number, since it is smaller than the sum of its proper divisors (99547120).

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

68775440 is a wasteful number, since it uses less digits than its factorization.

68775440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45279 (or 45273 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 68775440 is about 8293.0959237187. The cubic root of 68775440 is about 409.7111588463.

The spelling of 68775440 in words is "sixty-eight million, seven hundred seventy-five thousand, four hundred forty".