68870621 has 8 divisors (see below), whose sum is σ = 75436920. Its totient is φ = 62583808.

The previous prime is 68870591. The next prime is 68870629. The reversal of 68870621 is 12607886.

It can be written as a sum of positive squares in 4 ways, for example, as 26112100 + 42758521 = 5110^2 + 6539^2 .

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 68870621 - 2¹⁰ = 68869597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68870629) 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, 69356 + ... + 70341.

It is an arithmetic number, because the mean of its divisors is an integer number (9429615).

Almost surely, 2^68870621 is an apocalyptic number.

It is an amenable number.

68870621 is a deficient number, since it is larger than the sum of its proper divisors (6566299).

68870621 is a wasteful number, since it uses less digits than its factorization.

68870621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139743.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 68870621 is about 8298.8325082508. The cubic root of 68870621 is about 409.9000767795.

The spelling of 68870621 in words is "sixty-eight million, eight hundred seventy thousand, six hundred twenty-one".