68764491 has 16 divisors (see below), whose sum is σ = 102053920. Its totient is φ = 45761760.

The previous prime is 68764489. The next prime is 68764519. The reversal of 68764491 is 19446786.

It is not a de Polignac number, because 68764491 - 2¹ = 68764489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68764291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15921 + ... + 19773.

It is an arithmetic number, because the mean of its divisors is an integer number (6378370).

Almost surely, 2^68764491 is an apocalyptic number.

68764491 is a deficient number, since it is larger than the sum of its proper divisors (33289429).

68764491 is a wasteful number, since it uses less digits than its factorization.

68764491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523 (or 4517 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 68764491 is about 8292.4357700256. The cubic root of 68764491 is about 409.6894157863.

The spelling of 68764491 in words is "sixty-eight million, seven hundred sixty-four thousand, four hundred ninety-one".