68921644 has 12 divisors (see below), whose sum is σ = 131577768. Its totient is φ = 31328000.

The previous prime is 68921609. The next prime is 68921653. The reversal of 68921644 is 44612986.

It is a super-3 number, since 3×68921644³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68921597 and 68921606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783157 + ... + 783244.

It is an arithmetic number, because the mean of its divisors is an integer number (10964814).

Almost surely, 2^68921644 is an apocalyptic number.

It is an amenable number.

68921644 is a deficient number, since it is larger than the sum of its proper divisors (62656124).

68921644 is a wasteful number, since it uses less digits than its factorization.

68921644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566416 (or 1566414 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 68921644 is about 8301.9060462041. The cubic root of 68921644 is about 410.0012770137.

The spelling of 68921644 in words is "sixty-eight million, nine hundred twenty-one thousand, six hundred forty-four".