68409740 has 24 divisors (see below), whose sum is σ = 164183712. Its totient is φ = 23454720.

The previous prime is 68409739. The next prime is 68409743. The reversal of 68409740 is 4790486.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 68409694 and 68409703.

It is not an unprimeable number, because it can be changed into a prime (68409743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244181 + ... + 244460.

It is an arithmetic number, because the mean of its divisors is an integer number (6840988).

Almost surely, 2^68409740 is an apocalyptic number.

It is an amenable number.

68409740 is an abundant number, since it is smaller than the sum of its proper divisors (95773972).

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

68409740 is a wasteful number, since it uses less digits than its factorization.

68409740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488657 (or 488655 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 68409740 is about 8271.0180751828. The cubic root of 68409740 is about 408.9836814965.

The spelling of 68409740 in words is "sixty-eight million, four hundred nine thousand, seven hundred forty".