68690920 has 32 divisors (see below), whose sum is σ = 155108520. Its totient is φ = 27377920.

The previous prime is 68690893. The next prime is 68690929. The reversal of 68690920 is 2909686.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65642404 + 3048516 = 8102^2 + 1746^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (68690929) 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, 8790 + ... + 14650.

Almost surely, 2^68690920 is an apocalyptic number.

It is an amenable number.

68690920 is an abundant number, since it is smaller than the sum of its proper divisors (86417600).

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

68690920 is a wasteful number, since it uses less digits than its factorization.

68690920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165 (or 6161 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 68690920 is about 8287.9985521234. The cubic root of 68690920 is about 409.5432550022.

The spelling of 68690920 in words is "sixty-eight million, six hundred ninety thousand, nine hundred twenty".