68720944 has 10 divisors (see below), whose sum is σ = 133146860. Its totient is φ = 34360464.

The previous prime is 68720933. The next prime is 68720947. The reversal of 68720944 is 44902786.

It is a super-2 number, since 2×68720944² = 9445136288502272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68720897 and 68720906.

It is not an unprimeable number, because it can be changed into a prime (68720947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2147514 + ... + 2147545.

It is an arithmetic number, because the mean of its divisors is an integer number (13314686).

Almost surely, 2^68720944 is an apocalyptic number.

It is an amenable number.

68720944 is a deficient number, since it is larger than the sum of its proper divisors (64425916).

68720944 is a wasteful number, since it uses less digits than its factorization.

68720944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295067 (or 4295061 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 68720944 is about 8289.8096479955. The cubic root of 68720944 is about 409.6029151709.

The spelling of 68720944 in words is "sixty-eight million, seven hundred twenty thousand, nine hundred forty-four".