68705431 has 4 divisors (see below), whose sum is σ = 69575200. Its totient is φ = 67835664.

The previous prime is 68705407. The next prime is 68705467. The reversal of 68705431 is 13450786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68705431 - 2⁹ = 68704919 is a prime.

It is a super-2 number, since 2×68705431² = 9440872497791522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68705731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434766 + ... + 434923.

It is an arithmetic number, because the mean of its divisors is an integer number (17393800).

Almost surely, 2^68705431 is an apocalyptic number.

68705431 is a deficient number, since it is larger than the sum of its proper divisors (869769).

68705431 is an equidigital number, since it uses as much as digits as its factorization.

68705431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869768.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 68705431 is about 8288.8739283452. The cubic root of 68705431 is about 409.5720917283.

The spelling of 68705431 in words is "sixty-eight million, seven hundred five thousand, four hundred thirty-one".