68405436 has 36 divisors (see below), whose sum is σ = 188634264. Its totient is φ = 20728800.

The previous prime is 68405431. The next prime is 68405443. The reversal of 68405436 is 63450486.

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 68405436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68405431) 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, 85975 + ... + 86766.

Almost surely, 2^68405436 is an apocalyptic number.

68405436 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

68405436 is an abundant number, since it is smaller than the sum of its proper divisors (120228828).

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

68405436 is a wasteful number, since it uses less digits than its factorization.

68405436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172762 (or 172757 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 68405436 is about 8270.7578854661. The cubic root of 68405436 is about 408.9751042448.

It can be divided in two parts, 68 and 405436, that added together give a palindrome (405504).

The spelling of 68405436 in words is "sixty-eight million, four hundred five thousand, four hundred thirty-six".