68581021 has 8 divisors (see below), whose sum is σ = 70898688. Its totient is φ = 66270000.

The previous prime is 68581003. The next prime is 68581039. The reversal of 68581021 is 12018586.

It is an interprime number because it is at equal distance from previous prime (68581003) and next prime (68581039).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68581021 - 2⁷ = 68580893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68581061) 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, 27996 + ... + 30346.

It is an arithmetic number, because the mean of its divisors is an integer number (8862336).

Almost surely, 2^68581021 is an apocalyptic number.

It is an amenable number.

68581021 is a deficient number, since it is larger than the sum of its proper divisors (2317667).

68581021 is a wasteful number, since it uses less digits than its factorization.

68581021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 68581021 is about 8281.3658897551. The cubic root of 68581021 is about 409.3247282129.

The spelling of 68581021 in words is "sixty-eight million, five hundred eighty-one thousand, twenty-one".