68408680 has 64 divisors (see below), whose sum is σ = 168642000. Its totient is φ = 24858624.

The previous prime is 68408617. The next prime is 68408689. The reversal of 68408680 is 8680486.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 19660356 + 48748324 = 4434^2 + 6982^2 .

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 (68408689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17986 + ... + 21454.

Almost surely, 2^68408680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68408680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84321000).

68408680 is an abundant number, since it is smaller than the sum of its proper divisors (100233320).

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

68408680 is a wasteful number, since it uses less digits than its factorization.

68408680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526 (or 3522 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 68408680 is about 8270.9539957613. The cubic root of 68408680 is about 408.9815691027.

The spelling of 68408680 in words is "sixty-eight million, four hundred eight thousand, six hundred eighty".