68421864 has 32 divisors (see below), whose sum is σ = 195491520. Its totient is φ = 19549056.

The previous prime is 68421863. The next prime is 68421877. The reversal of 68421864 is 46812486.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (68421863) 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, 203469 + ... + 203804.

It is an arithmetic number, because the mean of its divisors is an integer number (6109110).

Almost surely, 2^68421864 is an apocalyptic number.

It is an amenable number.

68421864 is an abundant number, since it is smaller than the sum of its proper divisors (127069656).

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

68421864 is a wasteful number, since it uses less digits than its factorization.

68421864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407289 (or 407285 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 68421864 is about 8271.7509633692. The cubic root of 68421864 is about 409.0078409474.

The spelling of 68421864 in words is "sixty-eight million, four hundred twenty-one thousand, eight hundred sixty-four".