68823921 has 16 divisors (see below), whose sum is σ = 94601088. Its totient is φ = 44486400.

The previous prime is 68823917. The next prime is 68823943. The reversal of 68823921 is 12932886.

It is a happy number.

It is not a de Polignac number, because 68823921 - 2² = 68823917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68823921.

It is not an unprimeable number, because it can be changed into a prime (68823901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10345 + ... + 15641.

It is an arithmetic number, because the mean of its divisors is an integer number (5912568).

Almost surely, 2^68823921 is an apocalyptic number.

68823921 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

68823921 is a deficient number, since it is larger than the sum of its proper divisors (25777167).

68823921 is a wasteful number, since it uses less digits than its factorization.

68823921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432.

The product of its digits is 41472, while the sum is 39.

The square root of 68823921 is about 8296.0183823326. The cubic root of 68823921 is about 409.8074070671.

The spelling of 68823921 in words is "sixty-eight million, eight hundred twenty-three thousand, nine hundred twenty-one".