68921320 has 32 divisors (see below), whose sum is σ = 167002920. Its totient is φ = 25447680.

The previous prime is 68921309. The next prime is 68921323. The reversal of 68921320 is 2312986.

It can be written as a sum of positive squares in 4 ways, for example, as 52969284 + 15952036 = 7278^2 + 3994^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (68921323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65751 + ... + 66790.

Almost surely, 2^68921320 is an apocalyptic number.

It is an amenable number.

68921320 is an abundant number, since it is smaller than the sum of its proper divisors (98081600).

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

68921320 is a wasteful number, since it uses less digits than its factorization.

68921320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132565 (or 132561 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 68921320 is about 8301.8865325900. The cubic root of 68921320 is about 410.0006345419. Note that the first 3 decimals are identical.

The spelling of 68921320 in words is "sixty-eight million, nine hundred twenty-one thousand, three hundred twenty".