68906421 has 12 divisors (see below), whose sum is σ = 100446060. Its totient is φ = 45515520.

The previous prime is 68906417. The next prime is 68906437. The reversal of 68906421 is 12460986.

68906421 is a `hidden beast` number, since 6 + 8 + 9 + 0 + 642 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 62631396 + 6275025 = 7914^2 + 2505^2 .

It is not a de Polignac number, because 68906421 - 2² = 68906417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68906401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34140 + ... + 36101.

It is an arithmetic number, because the mean of its divisors is an integer number (8370505).

Almost surely, 2^68906421 is an apocalyptic number.

It is an amenable number.

68906421 is a deficient number, since it is larger than the sum of its proper divisors (31539639).

68906421 is a wasteful number, since it uses less digits than its factorization.

68906421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70356 (or 70353 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 68906421 is about 8300.9891579257. The cubic root of 68906421 is about 409.9710885820.

The spelling of 68906421 in words is "sixty-eight million, nine hundred six thousand, four hundred twenty-one".