68481720 has 64 divisors (see below), whose sum is σ = 228276000. Its totient is φ = 18261504.

The previous prime is 68481689. The next prime is 68481793. The reversal of 68481720 is 2718486.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 30625 + ... + 32784.

Almost surely, 2^68481720 is an apocalyptic number.

68481720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68481720 is an abundant number, since it is smaller than the sum of its proper divisors (159794280).

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

68481720 is a wasteful number, since it uses less digits than its factorization.

68481720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63429 (or 63419 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 68481720 is about 8275.3682697509. The cubic root of 68481720 is about 409.1270739745.

The spelling of 68481720 in words is "sixty-eight million, four hundred eighty-one thousand, seven hundred twenty".