68442491 has 8 divisors (see below), whose sum is σ = 74040960. Its totient is φ = 62891712.

The previous prime is 68442487. The next prime is 68442497. The reversal of 68442491 is 19424486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68442491 - 2² = 68442487 is a prime.

It is a super-3 number, since 3×68442491³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68442497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8906 + ... + 14703.

It is an arithmetic number, because the mean of its divisors is an integer number (9255120).

Almost surely, 2^68442491 is an apocalyptic number.

68442491 is a deficient number, since it is larger than the sum of its proper divisors (5598469).

68442491 is a wasteful number, since it uses less digits than its factorization.

68442491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23845.

The product of its digits is 55296, while the sum is 38.

The square root of 68442491 is about 8272.9977033721. The cubic root of 68442491 is about 409.0489377382.

Adding to 68442491 its sum of digits (38), we get a square (68442529 = 8273²).

The spelling of 68442491 in words is "sixty-eight million, four hundred forty-two thousand, four hundred ninety-one".