68685240 has 64 divisors (see below), whose sum is σ = 221911200. Its totient is φ = 16906752.

The previous prime is 68685193. The next prime is 68685259. The reversal of 68685240 is 4258686.

68685240 = 468² + 469² + ... + 675².

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 20455 + ... + 23574.

Almost surely, 2^68685240 is an apocalyptic number.

68685240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68685240 is an abundant number, since it is smaller than the sum of its proper divisors (153225960).

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

68685240 is a wasteful number, since it uses less digits than its factorization.

68685240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44056 (or 44052 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 68685240 is about 8287.6558808869. The cubic root of 68685240 is about 409.5319664175.

The spelling of 68685240 in words is "sixty-eight million, six hundred eighty-five thousand, two hundred forty".