68661240 has 32 divisors (see below), whose sum is σ = 205984080. Its totient is φ = 18309632.

The previous prime is 68661227. The next prime is 68661251. The reversal of 68661240 is 4216686.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285969 + ... + 286208.

Almost surely, 2^68661240 is an apocalyptic number.

68661240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68661240 is an abundant number, since it is smaller than the sum of its proper divisors (137322840).

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

68661240 is a wasteful number, since it uses less digits than its factorization.

68661240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572191 (or 572187 counting only the distinct ones).

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

The square root of 68661240 is about 8286.2078178139. The cubic root of 68661240 is about 409.4842613006.

The spelling of 68661240 in words is "sixty-eight million, six hundred sixty-one thousand, two hundred forty".