68720820 has 48 divisors (see below), whose sum is σ = 219907968. Its totient is φ = 15707520.

The previous prime is 68720819. The next prime is 68720833. The reversal of 68720820 is 2802786.

It is a super-2 number, since 2×68720820² = 9445102202944800, which contains 22 as substring.

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, 81391 + ... + 82230.

It is an arithmetic number, because the mean of its divisors is an integer number (4581416).

Almost surely, 2^68720820 is an apocalyptic number.

68720820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68720820 is an abundant number, since it is smaller than the sum of its proper divisors (151187148).

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

68720820 is a wasteful number, since it uses less digits than its factorization.

68720820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163640 (or 163638 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 68720820 is about 8289.8021689302. The cubic root of 68720820 is about 409.6026688084.

The spelling of 68720820 in words is "sixty-eight million, seven hundred twenty thousand, eight hundred twenty".