68748491 has 4 divisors (see below), whose sum is σ = 78569712. Its totient is φ = 58927272.

The previous prime is 68748487. The next prime is 68748521. The reversal of 68748491 is 19484786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19484786 = 2 ⋅9742393.

It is a cyclic number.

It is not a de Polignac number, because 68748491 - 2² = 68748487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68708491) 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, 4910600 + ... + 4910613.

It is an arithmetic number, because the mean of its divisors is an integer number (19642428).

Almost surely, 2^68748491 is an apocalyptic number.

68748491 is a deficient number, since it is larger than the sum of its proper divisors (9821221).

68748491 is an equidigital number, since it uses as much as digits as its factorization.

68748491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9821220.

The product of its digits is 387072, while the sum is 47.

The square root of 68748491 is about 8291.4709792654. The cubic root of 68748491 is about 409.6576380522.

The spelling of 68748491 in words is "sixty-eight million, seven hundred forty-eight thousand, four hundred ninety-one".