68440284 has 36 divisors (see below), whose sum is σ = 188730360. Its totient is φ = 20739360.

The previous prime is 68440259. The next prime is 68440289. The reversal of 68440284 is 48204486.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68440289) 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, 86019 + ... + 86810.

It is an arithmetic number, because the mean of its divisors is an integer number (5242510).

Almost surely, 2^68440284 is an apocalyptic number.

It is an amenable number.

68440284 is an abundant number, since it is smaller than the sum of its proper divisors (120290076).

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

68440284 is a wasteful number, since it uses less digits than its factorization.

68440284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172850 (or 172845 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 68440284 is about 8272.8643165472. The cubic root of 68440284 is about 409.0445409534.

It can be divided in two parts, 684402 and 84, that added together give a palindrome (684486).

The spelling of 68440284 in words is "sixty-eight million, four hundred forty thousand, two hundred eighty-four".