68240431 has 16 divisors (see below), whose sum is σ = 83350080. Its totient is φ = 54535680.

The previous prime is 68240429. The next prime is 68240449. The reversal of 68240431 is 13404286.

It is a cyclic number.

It is not a de Polignac number, because 68240431 - 2¹ = 68240429 is a prime.

It is a super-3 number, since 3×68240431³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68240431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68240401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10341 + ... + 15601.

It is an arithmetic number, because the mean of its divisors is an integer number (5209380).

Almost surely, 2^68240431 is an apocalyptic number.

68240431 is a deficient number, since it is larger than the sum of its proper divisors (15109649).

68240431 is a wasteful number, since it uses less digits than its factorization.

68240431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 68240431 is about 8260.7766584020. The cubic root of 68240431 is about 408.6460014045.

Subtracting from 68240431 its sum of digits (28), we obtain a triangular number (68240403 = T₁₁₆₈₂).

The spelling of 68240431 in words is "sixty-eight million, two hundred forty thousand, four hundred thirty-one".