68303640 has 32 divisors (see below), whose sum is σ = 204911280. Its totient is φ = 18214272.

The previous prime is 68303639. The next prime is 68303731. The reversal of 68303640 is 4630386.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 68303598 and 68303607.

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, 284479 + ... + 284718.

Almost surely, 2^68303640 is an apocalyptic number.

68303640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68303640 is an abundant number, since it is smaller than the sum of its proper divisors (136607640).

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

68303640 is a wasteful number, since it uses less digits than its factorization.

68303640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569211 (or 569207 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 68303640 is about 8264.6016237929. The cubic root of 68303640 is about 408.7721345176.

The spelling of 68303640 in words is "sixty-eight million, three hundred three thousand, six hundred forty".