68749999 has 4 divisors (see below), whose sum is σ = 72368440. Its totient is φ = 65131560.

The previous prime is 68749969. The next prime is 68750021. The reversal of 68749999 is 99994786.

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 68749999 - 2⁷ = 68749871 is a prime.

It is a Duffinian number.

68749999 is a modest number, since divided by 9999 gives 6874 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68749969) 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, 1809192 + ... + 1809229.

It is an arithmetic number, because the mean of its divisors is an integer number (18092110).

Almost surely, 2^68749999 is an apocalyptic number.

68749999 is a deficient number, since it is larger than the sum of its proper divisors (3618441).

68749999 is a wasteful number, since it uses less digits than its factorization.

68749999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618440.

The product of its digits is 8817984, while the sum is 61.

The square root of 68749999 is about 8291.5619155862. The cubic root of 68749999 is about 409.6606333141.

The spelling of 68749999 in words is "sixty-eight million, seven hundred forty-nine thousand, nine hundred ninety-nine".