68490240 has 352 divisors, whose sum is σ = 275116800. Its totient is φ = 14450688.

The previous prime is 68490239. The next prime is 68490277. The reversal of 68490240 is 4209486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5268474 + ... + 5268486.

Almost surely, 2^68490240 is an apocalyptic number.

68490240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68490240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137558400).

68490240 is an abundant number, since it is smaller than the sum of its proper divisors (206626560).

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

68490240 is a wasteful number, since it uses less digits than its factorization.

68490240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 68490240 is about 8275.8830344562. The cubic root of 68490240 is about 409.1440401475.

The spelling of 68490240 in words is "sixty-eight million, four hundred ninety thousand, two hundred forty".