68421870 has 144 divisors (see below), whose sum is σ = 200674656. Its totient is φ = 16156800.

The previous prime is 68421863. The next prime is 68421877. The reversal of 68421870 is 7812486.

It is an interprime number because it is at equal distance from previous prime (68421863) and next prime (68421877).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68421877) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 664239 + ... + 664341.

It is an arithmetic number, because the mean of its divisors is an integer number (1393574).

Almost surely, 2^68421870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68421870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100337328).

68421870 is an abundant number, since it is smaller than the sum of its proper divisors (132252786).

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

68421870 is a wasteful number, since it uses less digits than its factorization.

68421870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 68421870 is about 8271.7513260494. The cubic root of 68421870 is about 409.0078529029.

The spelling of 68421870 in words is "sixty-eight million, four hundred twenty-one thousand, eight hundred seventy".